52 lines
1.7 KiB
Diff
52 lines
1.7 KiB
Diff
From dca565886b5e8bd7966e15f0ca42ee5cff686673 Mon Sep 17 00:00:00 2001
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From: DJ Delorie <dj@redhat.com>
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Date: Thu, 25 Feb 2021 16:08:21 -0500
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Subject: [PATCH] nscd: Fix double free in netgroupcache [BZ #27462]
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In commit 745664bd798ec8fd50438605948eea594179fba1 a use-after-free
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was fixed, but this led to an occasional double-free. This patch
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tracks the "live" allocation better.
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Tested manually by a third party.
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Related: RHBZ 1927877
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Upstream-Status: Backport [https://sourceware.org/git/?p=glibc.git;a=commit;h=dca565886b5e8bd7966e15f0ca42ee5cff686673]
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CVE: CVE-2021-27645
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Signed-off-by: Khairul Rohaizzat Jamaluddin <khairul.rohaizzat.jamaluddin@intel.com>
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---
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nscd/netgroupcache.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
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index dba6ceec1b..ad2daddafd 100644
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--- a/nscd/netgroupcache.c
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+++ b/nscd/netgroupcache.c
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@@ -248,7 +248,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
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: NULL);
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ndomain = (ndomain ? newbuf + ndomaindiff
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: NULL);
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- buffer = newbuf;
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+ *tofreep = buffer = newbuf;
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}
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nhost = memcpy (buffer + bufused,
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@@ -319,7 +319,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
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else if (status == NSS_STATUS_TRYAGAIN && e == ERANGE)
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{
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buflen *= 2;
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- buffer = xrealloc (buffer, buflen);
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+ *tofreep = buffer = xrealloc (buffer, buflen);
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}
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else if (status == NSS_STATUS_RETURN
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|| status == NSS_STATUS_NOTFOUND
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--
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2.27.0
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