From 5c2c79eafdaffd172c20dd2cebc96f3dea266b96 Mon Sep 17 00:00:00 2001
From: kientzle <kientzle@FreeBSD.org>
Date: Tue, 13 Apr 2004 23:45:37 +0000
Subject:  * Plug a buffer overrun in ACL parsing. (archive_entry.c)  * Re-use
 a single buffer for shar output formatting rather    than hammering the heap.
 (archive_write_set_format_shar.c)  * Fix a handful of minor memory leaks and
 clean up some of the    memory-management code.

---
 lib/libarchive/archive_entry.c                    |  7 ++++
 lib/libarchive/archive_entry.h                    |  1 +
 lib/libarchive/archive_read.c                     |  6 +--
 lib/libarchive/archive_read_open_file.c           |  5 ++-
 lib/libarchive/archive_read_open_filename.c       |  5 ++-
 lib/libarchive/archive_read_support_format_cpio.c |  9 ++++-
 lib/libarchive/archive_read_support_format_tar.c  | 34 ++++++++---------
 lib/libarchive/archive_write.c                    |  4 +-
 lib/libarchive/archive_write_set_format_cpio.c    |  5 +++
 lib/libarchive/archive_write_set_format_pax.c     | 10 +++--
 lib/libarchive/archive_write_set_format_shar.c    | 46 ++++++++++++++++-------
 lib/libarchive/archive_write_set_format_ustar.c   | 18 +++++----
 12 files changed, 99 insertions(+), 51 deletions(-)

(limited to 'lib/libarchive')

diff --git a/lib/libarchive/archive_entry.c b/lib/libarchive/archive_entry.c
index be261f5..7ea63fc 100644
--- a/lib/libarchive/archive_entry.c
+++ b/lib/libarchive/archive_entry.c
@@ -481,6 +481,12 @@ archive_entry_set_hardlink(struct archive_entry *entry, const char *target)
 }
 
 void
+archive_entry_copy_hardlink(struct archive_entry *entry, const char *target)
+{
+	aes_copy_mbs(&entry->ae_hardlink, target);
+}
+
+void
 archive_entry_copy_hardlink_w(struct archive_entry *entry, const wchar_t *target)
 {
 	aes_copy_wcs(&entry->ae_hardlink, target);
@@ -1111,6 +1117,7 @@ __archive_entry_acl_parse_w(struct archive_entry *entry,
 				    malloc(namebuff_length * sizeof(wchar_t));
 			}
 			wmemcpy(namebuff, name_start, name_end - name_start);
+			namebuff[name_end - name_start] = L'\0';
 			archive_entry_acl_add_entry_w(entry, type,
 			    permset, tag, id, namebuff);
 		}
diff --git a/lib/libarchive/archive_entry.h b/lib/libarchive/archive_entry.h
index 385850b..733a60d 100644
--- a/lib/libarchive/archive_entry.h
+++ b/lib/libarchive/archive_entry.h
@@ -97,6 +97,7 @@ void	archive_entry_set_gid(struct archive_entry *, gid_t);
 void	archive_entry_set_gname(struct archive_entry *, const char *);
 void	archive_entry_copy_gname_w(struct archive_entry *, const wchar_t *);
 void	archive_entry_set_hardlink(struct archive_entry *, const char *);
+void	archive_entry_copy_hardlink(struct archive_entry *, const char *);
 void	archive_entry_copy_hardlink_w(struct archive_entry *, const wchar_t *);
 void	archive_entry_set_link(struct archive_entry *, const char *);
 void	archive_entry_set_mode(struct archive_entry *, mode_t);
diff --git a/lib/libarchive/archive_read.c b/lib/libarchive/archive_read.c
index ae2c8d8..7af242a 100644
--- a/lib/libarchive/archive_read.c
+++ b/lib/libarchive/archive_read.c
@@ -428,8 +428,8 @@ archive_read_finish(struct archive *a)
 
 	/* Casting a pointer to int allows us to remove 'const.' */
 	free((void *)(uintptr_t)(const void *)a->nulls);
-	if (a->extract_mkdirpath.s != NULL)
-		free(a->extract_mkdirpath.s);
+	archive_string_free(&a->extract_mkdirpath);
+	archive_string_free(&a->error_string);
 	if (a->entry)
 		archive_entry_free(a->entry);
 	a->magic = 0;
@@ -455,7 +455,7 @@ __archive_read_register_format(struct archive *a,
 
 	for (i = 0; i < number_slots; i++) {
 		if (a->formats[i].bid == bid)
-			return (0); /* We've already installed */
+			return (ARCHIVE_WARN); /* We've already installed */
 		if (a->formats[i].bid == NULL) {
 			a->formats[i].bid = bid;
 			a->formats[i].read_header = read_header;
diff --git a/lib/libarchive/archive_read_open_file.c b/lib/libarchive/archive_read_open_file.c
index f26a362..fa30bbb 100644
--- a/lib/libarchive/archive_read_open_file.c
+++ b/lib/libarchive/archive_read_open_file.c
@@ -68,7 +68,7 @@ archive_read_open_file(struct archive *a, const char *filename,
 		strcpy(mine->filename, filename);
 	}
 	mine->block_size = block_size;
-	mine->buffer = malloc(mine->block_size);
+	mine->buffer = NULL;
 	mine->fd = -1;
 	return (archive_read_open(a, mine, file_open, file_read, file_close));
 }
@@ -78,6 +78,7 @@ file_open(struct archive *a, void *client_data)
 {
 	struct read_file_data *mine = client_data;
 
+	mine->buffer = malloc(mine->block_size);
 	if (*mine->filename != 0)
 		mine->fd = open(mine->filename, O_RDONLY);
 	else
@@ -108,6 +109,8 @@ file_close(struct archive *a, void *client_data)
 	(void)a; /* UNUSED */
 	if (mine->fd >= 0)
 		close(mine->fd);
+	if (mine->buffer != NULL)
+		free(mine->buffer);
 	free(mine);
 	return (ARCHIVE_OK);
 }
diff --git a/lib/libarchive/archive_read_open_filename.c b/lib/libarchive/archive_read_open_filename.c
index f26a362..fa30bbb 100644
--- a/lib/libarchive/archive_read_open_filename.c
+++ b/lib/libarchive/archive_read_open_filename.c
@@ -68,7 +68,7 @@ archive_read_open_file(struct archive *a, const char *filename,
 		strcpy(mine->filename, filename);
 	}
 	mine->block_size = block_size;
-	mine->buffer = malloc(mine->block_size);
+	mine->buffer = NULL;
 	mine->fd = -1;
 	return (archive_read_open(a, mine, file_open, file_read, file_close));
 }
@@ -78,6 +78,7 @@ file_open(struct archive *a, void *client_data)
 {
 	struct read_file_data *mine = client_data;
 
+	mine->buffer = malloc(mine->block_size);
 	if (*mine->filename != 0)
 		mine->fd = open(mine->filename, O_RDONLY);
 	else
@@ -108,6 +109,8 @@ file_close(struct archive *a, void *client_data)
 	(void)a; /* UNUSED */
 	if (mine->fd >= 0)
 		close(mine->fd);
+	if (mine->buffer != NULL)
+		free(mine->buffer);
 	free(mine);
 	return (ARCHIVE_OK);
 }
diff --git a/lib/libarchive/archive_read_support_format_cpio.c b/lib/libarchive/archive_read_support_format_cpio.c
index 5ddc4f1..9abeeca 100644
--- a/lib/libarchive/archive_read_support_format_cpio.c
+++ b/lib/libarchive/archive_read_support_format_cpio.c
@@ -83,16 +83,21 @@ int
 archive_read_support_format_cpio(struct archive *a)
 {
 	struct cpio *cpio;
+	int r;
 
 	cpio = malloc(sizeof(*cpio));
 	memset(cpio, 0, sizeof(*cpio));
 	cpio->magic = CPIO_MAGIC;
 
-	return (__archive_read_register_format(a,
+	r = __archive_read_register_format(a,
 	    cpio,
 	    archive_read_format_cpio_bid,
 	    archive_read_format_cpio_read_header,
-	    archive_read_format_cpio_cleanup));
+	    archive_read_format_cpio_cleanup);
+
+	if (r != ARCHIVE_OK)
+		free(cpio);
+	return (ARCHIVE_OK);
 }
 
 
diff --git a/lib/libarchive/archive_read_support_format_tar.c b/lib/libarchive/archive_read_support_format_tar.c
index 8f6d521..b91162d 100644
--- a/lib/libarchive/archive_read_support_format_tar.c
+++ b/lib/libarchive/archive_read_support_format_tar.c
@@ -131,15 +131,19 @@ int
 archive_read_support_format_tar(struct archive *a)
 {
 	struct tar *tar;
+	int r;
 
 	tar = malloc(sizeof(*tar));
 	memset(tar, 0, sizeof(*tar));
 
-	return (__archive_read_register_format(a,
-	    tar,
+	r = __archive_read_register_format(a, tar,
 	    archive_read_format_tar_bid,
 	    archive_read_format_tar_read_header,
-	    archive_read_format_tar_cleanup));
+	    archive_read_format_tar_cleanup);
+
+	if (r != ARCHIVE_OK)
+		free(tar);
+	return (ARCHIVE_OK);
 }
 
 static int
@@ -148,19 +152,15 @@ archive_read_format_tar_cleanup(struct archive *a)
 	struct tar *tar;
 
 	tar = *(a->pformat_data);
-	if (tar->entry_name.s != NULL)
-		free(tar->entry_name.s);
-	if (tar->entry_linkname.s != NULL)
-		free(tar->entry_linkname.s);
-	if (tar->entry_uname.s != NULL)
-		free(tar->entry_uname.s);
-	if (tar->entry_gname.s != NULL)
-		free(tar->entry_gname.s);
-	if (tar->pax_header.s != NULL)
-		free(tar->pax_header.s);
-	if (tar->pax_global.s != NULL)
-		free(tar->pax_global.s);
-
+	archive_string_free(&tar->acl_text);
+	archive_string_free(&tar->entry_name);
+	archive_string_free(&tar->entry_linkname);
+	archive_string_free(&tar->entry_uname);
+	archive_string_free(&tar->entry_gname);
+	archive_string_free(&tar->pax_global);
+	archive_string_free(&tar->pax_header);
+	if (tar->pax_entry != NULL)
+		free(tar->pax_entry);
 	free(tar);
 	*(a->pformat_data) = NULL;
 	return (ARCHIVE_OK);
@@ -822,7 +822,7 @@ pax_header(struct archive *a, struct tar *tar, struct archive_entry *entry,
 		/* Ensure pax_entry buffer is big enough. */
 		if (tar->pax_entry_length <= line_length) {
 			if (tar->pax_entry_length <= 0)
-				tar->pax_entry_length = 256;
+				tar->pax_entry_length = 1024;
 			while (tar->pax_entry_length <= line_length + 1)
 				tar->pax_entry_length *= 2;
 
diff --git a/lib/libarchive/archive_write.c b/lib/libarchive/archive_write.c
index 2230dae..7b41e53 100644
--- a/lib/libarchive/archive_write.c
+++ b/lib/libarchive/archive_write.c
@@ -165,8 +165,8 @@ archive_write_finish(struct archive *a)
 
 	/* Release various dynamic buffers. */
 	free((void *)(uintptr_t)(const void *)a->nulls);
-	if (a->extract_mkdirpath.s != NULL)
-		free(a->extract_mkdirpath.s);
+	archive_string_free(&a->extract_mkdirpath);
+	archive_string_free(&a->error_string);
 	a->magic = 0;
 	free(a);
 }
diff --git a/lib/libarchive/archive_write_set_format_cpio.c b/lib/libarchive/archive_write_set_format_cpio.c
index 83e88ab..91f8283 100644
--- a/lib/libarchive/archive_write_set_format_cpio.c
+++ b/lib/libarchive/archive_write_set_format_cpio.c
@@ -207,10 +207,12 @@ format_octal_recursive(int64_t v, char *p, int s)
 static int
 archive_write_cpio_finish(struct archive *a)
 {
+	struct cpio *cpio;
 	struct stat st;
 	int er;
 	struct archive_entry *trailer;
 
+	cpio = a->format_data;
 	trailer = archive_entry_new();
 	memset(&st, 0, sizeof(st));
 	st.st_nlink = 1;
@@ -218,6 +220,9 @@ archive_write_cpio_finish(struct archive *a)
 	archive_entry_set_pathname(trailer, "TRAILER!!!");
 	er = archive_write_cpio_header(a, trailer);
 	archive_entry_free(trailer);
+
+	free(cpio);
+	a->format_data = NULL;
 	return (er);
 }
 
diff --git a/lib/libarchive/archive_write_set_format_pax.c b/lib/libarchive/archive_write_set_format_pax.c
index 503062c..efa38e2 100644
--- a/lib/libarchive/archive_write_set_format_pax.c
+++ b/lib/libarchive/archive_write_set_format_pax.c
@@ -611,7 +611,7 @@ archive_write_pax_header(struct archive *a,
 		    pax_attr_entry, 'x');
 
 		archive_entry_free(pax_attr_entry);
-		free(pax_entry_name.s);
+		archive_string_free(&pax_entry_name);
 
 		/* Note that the 'x' header shouldn't ever fail to format */
 		if (ret != 0) {
@@ -765,12 +765,16 @@ static int
 archive_write_pax_finish(struct archive *a)
 {
 	struct pax *pax;
+	int r;
+
+	r = ARCHIVE_OK;
 	pax = a->format_data;
 	if (pax->written && a->compression_write != NULL)
-		return (write_nulls(a, 512 * 2));
+		r = write_nulls(a, 512 * 2);
+	archive_string_free(&pax->pax_header);
 	free(pax);
 	a->format_data = NULL;
-	return (ARCHIVE_OK);
+	return (r);
 }
 
 static int
diff --git a/lib/libarchive/archive_write_set_format_shar.c b/lib/libarchive/archive_write_set_format_shar.c
index 76fa398..f063e21 100644
--- a/lib/libarchive/archive_write_set_format_shar.c
+++ b/lib/libarchive/archive_write_set_format_shar.c
@@ -38,16 +38,6 @@ __FBSDID("$FreeBSD$");
 #include "archive_entry.h"
 #include "archive_private.h"
 
-static int	archive_write_shar_finish(struct archive *);
-static int	archive_write_shar_header(struct archive *,
-		    struct archive_entry *);
-static int	archive_write_shar_data_sed(struct archive *,
-		    const void * buff, size_t);
-static int	archive_write_shar_data_uuencode(struct archive *,
-		    const void * buff, size_t);
-static int	archive_write_shar_finish_entry(struct archive *);
-static int	shar_printf(struct archive *, const char *fmt, ...);
-
 struct shar {
 	int			 dump;
 	int			 end_of_line;
@@ -60,19 +50,43 @@ struct shar {
 	int			 uuavail;
 	char			 uubuffer[3];
 	int			 wrote_header;
+	char			*work;
+	size_t			 work_len;
 };
 
+static int	archive_write_shar_finish(struct archive *);
+static int	archive_write_shar_header(struct archive *,
+		    struct archive_entry *);
+static int	archive_write_shar_data_sed(struct archive *,
+		    const void * buff, size_t);
+static int	archive_write_shar_data_uuencode(struct archive *,
+		    const void * buff, size_t);
+static int	archive_write_shar_finish_entry(struct archive *);
+static int	shar_printf(struct archive *, const char *fmt, ...);
+static void	uuencode_group(struct shar *);
+
 static int
 shar_printf(struct archive *a, const char *fmt, ...)
 {
+	struct shar *shar;
 	va_list ap;
-	char *p;
+	int required;
 	int ret;
 
+	shar = a->format_data;
+	if (shar->work_len <= 0) {
+		shar->work_len = 1024;
+		shar->work = malloc(shar->work_len);
+	}
+
 	va_start(ap, fmt);
-	vasprintf(&p, fmt, ap);
-	ret = ((a->compression_write)(a, p, strlen(p)));
-	free(p);
+	required = vsnprintf(shar->work, shar->work_len, fmt, ap);
+	if ((size_t)required >= shar->work_len) {
+		shar->work_len = required + 256;
+		realloc(shar->work, shar->work_len);
+		required = vsnprintf(shar->work, shar->work_len, fmt, ap);
+	}
+	ret = ((a->compression_write)(a, shar->work, strlen(shar->work)));
 	va_end(ap);
 	return (ret);
 }
@@ -261,6 +275,7 @@ archive_write_shar_header(struct archive *a, struct archive_entry *entry)
 	return (ARCHIVE_OK);
 }
 
+/* XXX TODO: This could be more efficient XXX */
 static int
 archive_write_shar_data_sed(struct archive *a, const void *buff, size_t length)
 {
@@ -297,6 +312,7 @@ archive_write_shar_data_sed(struct archive *a, const void *buff, size_t length)
 
 #define	UUENC(c)	(((c)!=0) ? ((c) & 077) + ' ': '`')
 
+/* XXX This could be a lot more efficient. XXX */
 static void
 uuencode_group(struct shar *shar)
 {
@@ -443,6 +459,8 @@ archive_write_shar_finish(struct archive *a)
 		archive_entry_free(shar->entry);
 	if (shar->last_dir != NULL)
 		free(shar->last_dir);
+	if (shar->work != NULL)
+		free(shar->work);
 	free(shar);
 	a->format_data = NULL;
 	return (ARCHIVE_OK);
diff --git a/lib/libarchive/archive_write_set_format_ustar.c b/lib/libarchive/archive_write_set_format_ustar.c
index 931f658..7d3c4a0 100644
--- a/lib/libarchive/archive_write_set_format_ustar.c
+++ b/lib/libarchive/archive_write_set_format_ustar.c
@@ -373,19 +373,20 @@ static int
 archive_write_ustar_finish(struct archive *a)
 {
 	struct ustar *ustar;
+	int r;
 
+	r = ARCHIVE_OK;
 	ustar = a->format_data;
 	/*
 	 * Suppress end-of-archive if nothing else was ever written.
-	 * This fixes a problem where setting one format, then another ends up
-	 * attempting to write a gratuitous end-of-archive marker.
+	 * This fixes a problem where setting one format, then another
+	 * ends up writing a gratuitous end-of-archive marker.
 	 */
 	if (ustar->written && a->compression_write != NULL)
-		if (write_nulls(a, 512*2) < 512*2)
-			return (ARCHIVE_FATAL);
-	free(a->format_data);
+		r = write_nulls(a, 512*2);
+	free(ustar);
 	a->format_data = NULL;
-	return (ARCHIVE_OK);
+	return (r);
 }
 
 static int
@@ -409,10 +410,11 @@ write_nulls(struct archive *a, size_t padding)
 	while (padding > 0) {
 		to_write = padding < a->null_length ? padding : a->null_length;
 		ret = (a->compression_write)(a, a->nulls, to_write);
-		if (ret < to_write) return (-1);
+		if (ret < to_write)
+			return (ARCHIVE_FATAL);
 		padding -= to_write;
 	}
-	return (0);
+	return (ARCHIVE_OK);
 }
 
 static int
-- 
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