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link_alt_odb_entry: fix read over array bounds reported by valgrind

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pfxlen can be longer than the path in objdir when relative_base
contains the path to gits object directory.  Here we are interested
in checking if ent->base[] (the part that corresponds to .git/objects)
is the same string as objdir, and the code NUL-terminated ent->base[]
to

	LEADING PATH\0XX/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\0

in preparation for these "duplicate check" step (before we return
from the function, the first NUL is turned into '/' so that we can
fill XX when probing for loose objects).  All we need to do is to
compare the string with the path to our object directory.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Heiko Voigt 2012-07-28 17:46:36 +02:00 committed by Junio C Hamano
parent d0f1ea6003
commit cb2912c324
1 changed files with 1 additions and 1 deletions
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2
sha1_file.c
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@ -298,7 +298,7 @@ static int link_alt_odb_entry(const char * entry, int len, const char * relative
return -1; return -1;
} }
} }
if (!memcmp(ent->base, objdir, pfxlen)) { if (!strcmp(ent->base, objdir)) {
free(ent); free(ent);
return -1; return -1;
} }