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nscd: Fix double free in netgroupcache [BZ #27462]

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In commit 745664bd79 a use-after-free
was fixed, but this led to an occasional double-free.  This patch
tracks the "live" allocation better.

Tested manually by a third party.

Related: RHBZ 1927877

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit dca565886b)
This commit is contained in:
DJ Delorie 2021-02-25 16:08:21 -05:00 committed by Siddhesh Poyarekar
parent e9db77683e
commit 4352eb4e5d
1 changed files with 2 additions and 2 deletions
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4
nscd/netgroupcache.c
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@ -248,7 +248,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
: NULL);
ndomain = (ndomain ? newbuf + ndomaindiff
: NULL);
buffer = newbuf;
*tofreep = buffer = newbuf;
}
nhost = memcpy (buffer + bufused,
@ -319,7 +319,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
else if (status == NSS_STATUS_TRYAGAIN && e == ERANGE)
{
buflen *= 2;
buffer = xrealloc (buffer, buflen);
*tofreep = buffer = xrealloc (buffer, buflen);
}
else if (status == NSS_STATUS_RETURN
|| status == NSS_STATUS_NOTFOUND