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cache: don't leave cache_slot fields uninitialized

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Valgrind says:

==18344== Conditional jump or move depends on uninitialised value(s)
==18344==    at 0x406C83: open_slot (cache.c:63)
==18344==    by 0x407478: cache_ls (cache.c:403)
==18344==    by 0x404C9A: process_request (cgit.c:639)
==18344==    by 0x406BD2: fill_slot (cache.c:190)
==18344==    by 0x4071A0: cache_process (cache.c:284)
==18344==    by 0x404461: main (cgit.c:952)
==18344==  Uninitialised value was created by a stack allocation
==18344==    at 0x40738B: cache_ls (cache.c:375)

This is caused by the keylen field being used to calculate whether or
not a slot is matched.  We never then check the value of this and the
length of data read depends on the key length read from the file so this
isn't dangerous, but it's nice to avoid branching based on uninitialized
data.

Signed-off-by: John Keeping <john@keeping.me.uk>
This commit is contained in:
John Keeping 2014-01-12 16:49:40 +00:00 committed by Jason A. Donenfeld
parent 3eae406934
commit 382ecf152e
1 changed files with 1 additions and 1 deletions
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cache.c
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@ -376,7 +376,7 @@ int cache_ls(const char *path)
DIR *dir; DIR *dir;
struct dirent *ent; struct dirent *ent;
int err = 0; int err = 0;
struct cache_slot slot; struct cache_slot slot = { 0 };
struct strbuf fullname = STRBUF_INIT; struct strbuf fullname = STRBUF_INIT;
size_t prefixlen; size_t prefixlen;