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authoralc <alc@FreeBSD.org>2003-11-13 05:26:55 +0000
committeralc <alc@FreeBSD.org>2003-11-13 05:26:55 +0000
commit5bdb94b83897181357935dfd40c365aa2a5300ac (patch)
tree27152bd757f1ebe7d74ab5221256a0b8e6df8d91 /bin
parent5bfac52170643473ecffbdd7b8bcdbf46cae0887 (diff)
downloadFreeBSD-src-5bdb94b83897181357935dfd40c365aa2a5300ac.zip
FreeBSD-src-5bdb94b83897181357935dfd40c365aa2a5300ac.tar.gz
Don't mmap(2) and munmap(2) zero-length files.
Submitted by: Wiktor Niesiobedzki <bsd@w.evip.pl>
Diffstat (limited to 'bin')
-rw-r--r--bin/cp/utils.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/bin/cp/utils.c b/bin/cp/utils.c
index e8c542c..782dc6b 100644
--- a/bin/cp/utils.c
+++ b/bin/cp/utils.c
@@ -133,7 +133,8 @@ copy_file(const FTSENT *entp, int dne)
* wins some CPU back.
*/
#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
- if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) {
+ if (S_ISREG(fs->st_mode) && fs->st_size > 0 &&
+ fs->st_size <= 8 * 1048576) {
if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
warn("%s", entp->fts_path);
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