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archive-tar: use parse_config_key when parsing config

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This is fewer lines of code, but more importantly, fixes a
bogus pointer offset. We are looking for "tar." in the
section, but later assume that the dot we found is at offset
9, not 3. This is a holdover from an earlier iteration of
767cf45 which called the section "tarfilter".

As a result, we could erroneously reject some filters with
dots in their name, as well as read uninitialized memory.

Reported by (and test by) René Scharfe.

Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2013-01-23 01:23:27 -05:00
committed by Junio C Hamano
parent 1b86bbb0ad
commit 785a042981
2 changed files with 3 additions and 10 deletions
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10
archive-tar.c
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@ -327,20 +327,12 @@ static struct archiver *find_tar_filter(const char *name, int len)
static int tar_filter_config(const char *var, const char *value, void *data)
{
struct archiver *ar;
const char *dot;
const char *name;
const char *type;
int namelen;
if (prefixcmp(var, "tar."))
if (parse_config_key(var, "tar", &name, &namelen, &type) < 0 || !name)
return 0;
dot = strrchr(var, '.');
if (dot == var + 9)
return 0;
name = var + 4;
namelen = dot - name;
type = dot + 1;
ar = find_tar_filter(name, namelen);
if (!ar) {