progress: don't dereference before checking for NULL
In `stop_progress()`, we're careful to check that `p_progress` is
non-NULL before we dereference it, but by then we have already
dereferenced it when calling `finish_if_sparse(*p_progress)`. And, for
what it's worth, we'll go on to blindly dereference it again inside
`stop_progress_msg()`.
We could return early if we get a NULL-pointer, but let's go one step
further and BUG instead. The progress API handles NULL just fine, but
that's the NULL-ness of `*p_progress`, e.g., when running with
`--no-progress`. If `p_progress` is NULL, chances are that's a mistake.
For symmetry, let's do the same check in `stop_progress_msg()`, too.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/progress.c b/progress.c
index 6d2dcff..66ad941 100644
--- a/progress.c
+++ b/progress.c
@@ -319,9 +319,12 @@ static void finish_if_sparse(struct progress *progress)
void stop_progress(struct progress **p_progress)
{
+ if (!p_progress)
+ BUG("don't provide NULL to stop_progress");
+
finish_if_sparse(*p_progress);
- if (p_progress && *p_progress) {
+ if (*p_progress) {
trace2_data_intmax("progress", the_repository, "total_objects",
(*p_progress)->total);
@@ -342,7 +345,12 @@ void stop_progress(struct progress **p_progress)
void stop_progress_msg(struct progress **p_progress, const char *msg)
{
- struct progress *progress = *p_progress;
+ struct progress *progress;
+
+ if (!p_progress)
+ BUG("don't provide NULL to stop_progress_msg");
+
+ progress = *p_progress;
if (!progress)
return;
*p_progress = NULL;
