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authorPavel Roskin <proski@gnu.org>2005-07-29 10:49:14 -0400
committerJunio C Hamano <junkio@cox.net>2005-07-29 17:21:48 -0700
commite35f9824159bba94eecdf22d198799701ed60940 (patch)
tree0d1d08eec92d179ce02b4c4b5e961e0f6c1feddc /read-cache.c
parent1df092d211868b3b74f5b3981fad9b195a0bedad (diff)
downloadgit-e35f9824159bba94eecdf22d198799701ed60940.tar.gz
git-e35f9824159bba94eecdf22d198799701ed60940.tar.xz
[PATCH] mmap error handling
I have reviewed all occurrences of mmap() in git and fixed three types of errors/defects: 1) The result is not checked. 2) The file descriptor is closed if mmap() succeeds, but not when it fails. 3) Various casts applied to -1 are used instead of MAP_FAILED, which is specifically defined to check mmap() return value. [jc: This is a second round of Pavel's patch. He fixed up the problem that close() potentially clobbering the errno from mmap, which the first round had.] Signed-off-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'read-cache.c')
-rw-r--r--read-cache.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/read-cache.c b/read-cache.c
index f448ab17e..5820f18d9 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -392,7 +392,7 @@ int read_cache(void)
return (errno == ENOENT) ? 0 : error("open failed");
size = 0; // avoid gcc warning
- map = (void *)-1;
+ map = MAP_FAILED;
if (!fstat(fd, &st)) {
size = st.st_size;
errno = EINVAL;
@@ -400,7 +400,7 @@ int read_cache(void)
map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
}
close(fd);
- if (-1 == (int)(long)map)
+ if (map == MAP_FAILED)
return error("mmap failed");
hdr = map;