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commit dca565886b5e8bd7966e15f0ca42ee5cff686673
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Author: DJ Delorie <dj@redhat.com>
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Date: Thu Feb 25 16:08:21 2021 -0500
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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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diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
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index d234eb5ac48c73f2..e388ff91fea46e0c 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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