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authorJunio C Hamano <gitster@pobox.com>2013-12-17 18:43:30 (GMT)
committerJunio C Hamano <gitster@pobox.com>2013-12-17 18:43:30 (GMT)
commitc235d960cb32ddca352d12c3f8dc053ddfd421dd (patch)
tree5c9edd349b4a6cfcbf77ca30b47c15933114b62b /builtin/prune-packed.c
parentd7aced95cd681b761468635f8d2a8b82d7ed26fd (diff)
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prune-packed: use strbuf to avoid having to worry about PATH_MAX
A/very/long/path/to/.git that becomes exactly PATH_MAX bytes long after suffixed with /objects/??/??38-hex??, would have overflown the on-stack pathname[] buffer. Noticed-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/prune-packed.c')
-rw-r--r--builtin/prune-packed.c38
1 files changed, 21 insertions, 17 deletions
diff --git a/builtin/prune-packed.c b/builtin/prune-packed.c
index fa6ce42..fcf5fb6 100644
--- a/builtin/prune-packed.c
+++ b/builtin/prune-packed.c
@@ -10,58 +10,62 @@ static const char * const prune_packed_usage[] = {
static struct progress *progress;
-static void prune_dir(int i, DIR *dir, char *pathname, int len, int opts)
+static void prune_dir(int i, DIR *dir, struct strbuf *pathname, int opts)
{
struct dirent *de;
char hex[40];
+ int top_len = pathname->len;
sprintf(hex, "%02x", i);
while ((de = readdir(dir)) != NULL) {
unsigned char sha1[20];
if (strlen(de->d_name) != 38)
continue;
- memcpy(hex+2, de->d_name, 38);
+ memcpy(hex + 2, de->d_name, 38);
if (get_sha1_hex(hex, sha1))
continue;
if (!has_sha1_pack(sha1))
continue;
- memcpy(pathname + len, de->d_name, 38);
+
+ strbuf_add(pathname, de->d_name, 38);
if (opts & PRUNE_PACKED_DRY_RUN)
- printf("rm -f %s\n", pathname);
+ printf("rm -f %s\n", pathname->buf);
else
- unlink_or_warn(pathname);
+ unlink_or_warn(pathname->buf);
display_progress(progress, i + 1);
+ strbuf_setlen(pathname, top_len);
}
}
void prune_packed_objects(int opts)
{
int i;
- static char pathname[PATH_MAX];
const char *dir = get_object_directory();
- int len = strlen(dir);
+ struct strbuf pathname = STRBUF_INIT;
+ int top_len;
+ strbuf_addstr(&pathname, dir);
if (opts & PRUNE_PACKED_VERBOSE)
progress = start_progress_delay("Removing duplicate objects",
256, 95, 2);
- if (len > PATH_MAX - 42)
- die("impossible object directory");
- memcpy(pathname, dir, len);
- if (len && pathname[len-1] != '/')
- pathname[len++] = '/';
+ if (pathname.len && pathname.buf[pathname.len - 1] != '/')
+ strbuf_addch(&pathname, '/');
+
+ top_len = pathname.len;
for (i = 0; i < 256; i++) {
DIR *d;
display_progress(progress, i + 1);
- sprintf(pathname + len, "%02x/", i);
- d = opendir(pathname);
+ strbuf_setlen(&pathname, top_len);
+ strbuf_addf(&pathname, "%02x/", i);
+ d = opendir(pathname.buf);
if (!d)
continue;
- prune_dir(i, d, pathname, len + 3, opts);
+ prune_dir(i, d, &pathname, opts);
closedir(d);
- pathname[len + 2] = '\0';
- rmdir(pathname);
+ strbuf_setlen(&pathname, top_len + 2);
+ rmdir(pathname.buf);
}
stop_progress(&progress);
}