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pack-objects: avoid reading uninitalized data

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In the main loop of find_deltas, we do:

  struct object_entry *entry = *list++;
  ...
  if (!*list_size)
	  ...
	  break

Because we look at and increment *list _before_ the check of
list_size, in the very last iteration of the loop we will
look at uninitialized data, and increment the pointer beyond
one past the end of the allocated space. Since we don't
actually do anything with the data until after the check,
this is not a problem in practice.

But since it technically violates the C standard, and
because it provokes a spurious valgrind warning, let's just
move the initialization of entry to a safe place.

This fixes valgrind errors in t5300, t5301, t5302, t303, and
t9400.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2008-10-23 04:31:03 +00:00 committed by Junio C Hamano
parent 13494ed14c
commit 421b488a58
1 changed files with 2 additions and 1 deletions
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3
builtin-pack-objects.c
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@ -1377,7 +1377,7 @@ static void find_deltas(struct object_entry **list, unsigned *list_size,
memset(array, 0, array_size);
for (;;) {
struct object_entry *entry = *list++;
struct object_entry *entry;
struct unpacked *n = array + idx;
int j, max_depth, best_base = -1;
@ -1386,6 +1386,7 @@ static void find_deltas(struct object_entry **list, unsigned *list_size,
progress_unlock();
break;
}
entry = *list++;
(*list_size)--;
if (!entry->preferred_base) {
(*processed)++;