43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
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From a151f2e05a64727c552a297d129b8ef242ffb3b6 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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(cherry picked from commit dca565886b5e8bd7966e15f0ca42ee5cff686673)
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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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Index: glibc-2.33/nscd/netgroupcache.c
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===================================================================
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--- glibc-2.33.orig/nscd/netgroupcache.c
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+++ glibc-2.33/nscd/netgroupcache.c
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@@ -248,7 +248,7 @@ addgetnetgrentX (struct database_dyn *db
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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
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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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