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| author | DJ Delorie <dj@redhat.com> | 2021-02-25 16:08:21 -0500 |
|---|---|---|
| committer | DJ Delorie <dj@redhat.com> | 2021-03-02 12:32:18 -0500 |
| commit | dca565886b5e8bd7966e15f0ca42ee5cff686673 (patch) | |
| tree | 53fe3258cc1f561b046f3044edd1c44cda8e3c7f | |
| parent | dd1776e3275b89b8ff76e8cfd8cd283f51a9aaaf (diff) | |
| download | glibc-dca565886b5e8bd7966e15f0ca42ee5cff686673.tar.gz | |
nscd: Fix double free in netgroupcache [BZ #27462]
In commit 745664bd798ec8fd50438605948eea594179fba1 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>
| -rw-r--r-- | nscd/netgroupcache.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c index dba6ceec1b..ad2daddafd 100644 --- a/nscd/netgroupcache.c +++ b/nscd/netgroupcache.c @@ -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 |