From a5aa842a0597ef9a24e80966b02ca01f287fb334 Mon Sep 17 00:00:00 2001
From: Christophe Fergeau <cfergeau@redhat.com>
Date: Fri, 22 Jul 2011 13:42:18 +0200
Subject: libcacard: fix soft=... parsing in vcard_emul_options

The previous parser had copy and paste errors when computing
vname_length and type_params_length, "name" was used instead
of respectively vname and type_params. This led to length that could
be bigger than the input string, and to access out of the array
bounds when trying to copy these strings. valgrind rightfully
complained about this. It also didn't handle empty fields correctly,

Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Reviewed-by: Alon Levy <alevy@redhat.com>
---
 libcacard/vcard_emul_nss.c | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)

(limited to 'libcacard/vcard_emul_nss.c')

diff --git a/libcacard/vcard_emul_nss.c b/libcacard/vcard_emul_nss.c
index 8c59eff..3360f6c 100644
--- a/libcacard/vcard_emul_nss.c
+++ b/libcacard/vcard_emul_nss.c
@@ -1110,8 +1110,6 @@ vcard_emul_options(const char *args)
 {
     int reader_count = 0;
     VCardEmulOptions *opts;
-    char type_str[100];
-    int type_len;
 
     /* Allow the future use of allocating the options structure on the fly */
     memcpy(&options, &default_options, sizeof(options));
@@ -1126,18 +1124,24 @@ vcard_emul_options(const char *args)
          *       cert_2,cert_3...) */
         if (strncmp(args, "soft=", 5) == 0) {
             const char *name;
+            size_t name_length;
             const char *vname;
+            size_t vname_length;
             const char *type_params;
+            size_t type_params_length;
+            char type_str[100];
             VCardEmulType type;
-            int name_length, vname_length, type_params_length, count, i;
+            int count, i;
             VirtualReaderOptions *vreaderOpt = NULL;
 
             args = strip(args + 5);
             if (*args != '(') {
                 continue;
             }
+            args = strip(args+1);
+
             name = args;
-            args = strpbrk(args + 1, ",)");
+            args = strpbrk(args, ",)");
             if (*args == 0) {
                 break;
             }
@@ -1145,10 +1149,11 @@ vcard_emul_options(const char *args)
                 args++;
                 continue;
             }
+            name_length = args - name;
             args = strip(args+1);
-            name_length = args - name - 2;
+
             vname = args;
-            args = strpbrk(args + 1, ",)");
+            args = strpbrk(args, ",)");
             if (*args == 0) {
                 break;
             }
@@ -1156,13 +1161,10 @@ vcard_emul_options(const char *args)
                 args++;
                 continue;
             }
-            vname_length = args - name - 2;
+            vname_length = args - vname;
             args = strip(args+1);
-            type_len = strpbrk(args, ",)") - args;
-            assert(sizeof(type_str) > type_len);
-            strncpy(type_str, args, type_len);
-            type_str[type_len] = 0;
-            type = vcard_emul_type_from_string(type_str);
+
+            type_params = args;
             args = strpbrk(args, ",)");
             if (*args == 0) {
                 break;
@@ -1171,9 +1173,16 @@ vcard_emul_options(const char *args)
                 args++;
                 continue;
             }
+            type_params_length = args - type_params;
             args = strip(args+1);
+
+            type_params_length = MIN(type_params_length, sizeof(type_str)-1);
+            strncpy(type_str, type_params, type_params_length);
+            type_str[type_params_length] = 0;
+            type = vcard_emul_type_from_string(type_str);
+
             type_params = args;
-            args = strpbrk(args + 1, ",)");
+            args = strpbrk(args, ",)");
             if (*args == 0) {
                 break;
             }
@@ -1181,8 +1190,9 @@ vcard_emul_options(const char *args)
                 args++;
                 continue;
             }
-            type_params_length = args - name;
+            type_params_length = args - type_params;
             args = strip(args+1);
+
             if (*args == 0) {
                 break;
             }
@@ -1202,13 +1212,14 @@ vcard_emul_options(const char *args)
             vreaderOpt->card_type = type;
             vreaderOpt->type_params =
                 copy_string(type_params, type_params_length);
-            count = count_tokens(args, ',', ')');
+            count = count_tokens(args, ',', ')') + 1;
             vreaderOpt->cert_count = count;
             vreaderOpt->cert_name = (char **)qemu_malloc(count*sizeof(char *));
             for (i = 0; i < count; i++) {
-                const char *cert = args + 1;
-                args = strpbrk(args + 1, ",)");
+                const char *cert = args;
+                args = strpbrk(args, ",)");
                 vreaderOpt->cert_name[i] = copy_string(cert, args - cert);
+                args = strip(args+1);
             }
             if (*args == ')') {
                 args++;
-- 
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