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authorJeff King <peff@peff.net>2012-10-12 06:22:49 (GMT)
committerJunio C Hamano <gitster@pobox.com>2012-10-12 16:42:31 (GMT)
commit188923f0d1c8148415b3173986cd1e21871c947e (patch)
treef62cb81f35c64e98c71caa596a0cd0eebccb8f2d
parentb81401c1de0e0fec39f8643ce7a794fda083f7a1 (diff)
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http: fix segfault in handle_curl_result
When we create an http active_request_slot, we can set its "results" pointer back to local storage. The http code will fill in the details of how the request went, and we can access those details even after the slot has been cleaned up. Commit 8809703 (http: factor out http error code handling) switched us from accessing our local results struct directly to accessing it via the "results" pointer of the slot. That means we're accessing the slot after it has been marked as finished, defeating the whole purpose of keeping the results storage separate. Most of the time this doesn't matter, as finishing the slot does not actually clean up the pointer. However, when using curl's multi interface with the dumb-http revision walker, we might actually start a new request before handing control back to the original caller. In that case, we may reuse the slot, zeroing its results pointer, and leading the original caller to segfault while looking for its results inside the slot. Instead, we need to pass a pointer to our local results storage to the handle_curl_result function, rather than relying on the pointer in the slot struct. This matches what the original code did before the refactoring (which did not use a separate function, and therefore just accessed the results struct directly). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--http.c7
-rw-r--r--http.h3
-rw-r--r--remote-curl.c2
3 files changed, 6 insertions, 6 deletions
diff --git a/http.c b/http.c
index 7c4a407..9334386 100644
--- a/http.c
+++ b/http.c
@@ -744,10 +744,9 @@ char *get_remote_object_url(const char *url, const char *hex,
return strbuf_detach(&buf, NULL);
}
-int handle_curl_result(struct active_request_slot *slot)
+int handle_curl_result(struct active_request_slot *slot,
+ struct slot_results *results)
{
- struct slot_results *results = slot->results;
-
if (results->curl_result == CURLE_OK) {
credential_approve(&http_auth);
return HTTP_OK;
@@ -818,7 +817,7 @@ static int http_request(const char *url, void *result, int target, int options)
if (start_active_slot(slot)) {
run_active_slot(slot);
- ret = handle_curl_result(slot);
+ ret = handle_curl_result(slot, &results);
} else {
error("Unable to start HTTP request for %s", url);
ret = HTTP_START_FAILED;
diff --git a/http.h b/http.h
index 12de255..0bd1e84 100644
--- a/http.h
+++ b/http.h
@@ -78,7 +78,8 @@ extern int start_active_slot(struct active_request_slot *slot);
extern void run_active_slot(struct active_request_slot *slot);
extern void finish_active_slot(struct active_request_slot *slot);
extern void finish_all_active_slots(void);
-extern int handle_curl_result(struct active_request_slot *slot);
+extern int handle_curl_result(struct active_request_slot *slot,
+ struct slot_results *results);
#ifdef USE_CURL_MULTI
extern void fill_active_slots(void);
diff --git a/remote-curl.c b/remote-curl.c
index 3ec474f..6054e47 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -369,7 +369,7 @@ static int run_slot(struct active_request_slot *slot)
slot->curl_result = curl_easy_perform(slot->curl);
finish_active_slot(slot);
- err = handle_curl_result(slot);
+ err = handle_curl_result(slot, &results);
if (err != HTTP_OK && err != HTTP_REAUTH) {
error("RPC failed; result=%d, HTTP code = %ld",
results.curl_result, results.http_code);