In the fetch_index implementations in http-push.c and http-walker.c,
the string returned by sha1_to_hex is assumed to stay immutable.
This patch ensures that hex stays immutable by copying the string
returned by sha1_to_hex (via xstrdup) and frees it subsequently. It
also refactors free()'s and fclose()'s with labels.
Signed-off-by: Tay Ray Chuan <rctay89@xxxxxxxxx>
---
http-push.c | 45 ++++++++++++++++++++++++---------------------
http-walker.c | 43 +++++++++++++++++++++++--------------------
2 files changed, 47 insertions(+), 41 deletions(-)
diff --git a/http-push.c b/http-push.c
index c55bd81..1011ca8 100644
--- a/http-push.c
+++ b/http-push.c
@@ -954,7 +954,8 @@ static int add_send_request(struct object *obj, struct remote_lock *lock)
static int fetch_index(unsigned char *sha1)
{
- char *hex = sha1_to_hex(sha1);
+ int ret = 0;
+ char *hex = xstrdup(sha1_to_hex(sha1));
char *filename;
char *url;
char tmpfile[PATH_MAX];
@@ -976,18 +977,18 @@ static int fetch_index(unsigned char *sha1)
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK) {
- free(url);
- return error("Unable to verify pack %s is available",
- hex);
+ ret = error("Unable to verify pack %s is available",
+ hex);
+ goto cleanup_pack;
}
} else {
- free(url);
- return error("Unable to start request");
+ ret = error("Unable to start request");
+ goto cleanup_pack;
}
if (has_pack_index(sha1)) {
- free(url);
- return 0;
+ ret = 0;
+ goto cleanup_pack;
}
if (push_verbosely)
@@ -999,9 +1000,9 @@ static int fetch_index(unsigned char *sha1)
snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
indexfile = fopen(tmpfile, "a");
if (!indexfile) {
- free(url);
- return error("Unable to open local file %s for pack index",
- tmpfile);
+ ret = error("Unable to open local file %s for pack index",
+ tmpfile);
+ goto cleanup_pack;
}
slot = get_active_slot();
@@ -1032,21 +1033,23 @@ static int fetch_index(unsigned char *sha1)
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK) {
- free(url);
- fclose(indexfile);
- return error("Unable to get pack index %s\n%s", url,
- curl_errorstr);
+ ret = error("Unable to get pack index %s\n%s", url,
+ curl_errorstr);
+ goto cleanup_index;
}
} else {
- free(url);
- fclose(indexfile);
- return error("Unable to start request");
+ ret = error("Unable to start request");
+ goto cleanup_index;
}
- free(url);
- fclose(indexfile);
+ ret = move_temp_to_file(tmpfile, filename);
- return move_temp_to_file(tmpfile, filename);
+cleanup_index:
+ fclose(indexfile);
+cleanup_pack:
+ free(url);
+ free(hex);
+ return ret;
}
static int setup_index(unsigned char *sha1)
diff --git a/http-walker.c b/http-walker.c
index cf46adb..8bf83d0 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -371,7 +371,8 @@ static void prefetch(struct walker *walker, unsigned char *sha1)
static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
{
- char *hex = sha1_to_hex(sha1);
+ int ret = 0;
+ char *hex = xstrdup(sha1_to_hex(sha1));
char *filename;
char *url;
char tmpfile[PATH_MAX];
@@ -394,18 +395,18 @@ static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned ch
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK) {
- free(url);
- return error("Unable to verify pack %s is available",
+ ret = error("Unable to verify pack %s is available",
hex);
+ goto cleanup_pack;
}
} else {
- free(url);
- return error("Unable to start request");
+ ret = error("Unable to start request");
+ goto cleanup_pack;
}
if (has_pack_index(sha1)) {
- free(url);
- return 0;
+ ret = 0;
+ goto cleanup_pack;
}
if (walker->get_verbosely)
@@ -417,9 +418,9 @@ static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned ch
snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
indexfile = fopen(tmpfile, "a");
if (!indexfile) {
- free(url);
- return error("Unable to open local file %s for pack index",
- tmpfile);
+ ret = error("Unable to open local file %s for pack index",
+ tmpfile);
+ goto cleanup_pack;
}
slot = get_active_slot();
@@ -450,21 +451,23 @@ static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned ch
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result != CURLE_OK) {
- free(url);
- fclose(indexfile);
- return error("Unable to get pack index %s\n%s", url,
- curl_errorstr);
+ ret = error("Unable to get pack index %s\n%s", url,
+ curl_errorstr);
+ goto cleanup_index;
}
} else {
- free(url);
- fclose(indexfile);
- return error("Unable to start request");
+ ret = error("Unable to start request");
+ goto cleanup_index;
}
- free(url);
- fclose(indexfile);
+ ret = move_temp_to_file(tmpfile, filename);
- return move_temp_to_file(tmpfile, filename);
+cleanup_index:
+ fclose(indexfile);
+cleanup_pack:
+ free(url);
+ free(hex);
+ return ret;
}
static int setup_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
--
1.6.3.rc0
--
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