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From 3a4d59e5cb35cf2395cfd8004dd16d45dd889e11 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Thu, 5 Dec 2019 16:35:51 +0100
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Subject: [PATCH] extensions: among: Check call to fstat()
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If this fails, a bogus length value may be passed to mmap().
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Fixes: 26753888720d8 ("nft: bridge: Rudimental among extension support")
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(cherry picked from commit 25b38bcbf2fdc019f438805c7d1ecd877af9c968)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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extensions/libebt_among.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/extensions/libebt_among.c b/extensions/libebt_among.c
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index 2e87db3bc06fa..715d559f432c2 100644
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--- a/extensions/libebt_among.c
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+++ b/extensions/libebt_among.c
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@@ -6,6 +6,7 @@
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* August, 2003
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*/
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+#include <errno.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <getopt.h>
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@@ -137,7 +138,10 @@ static int bramong_parse(int c, char **argv, int invert,
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if ((fd = open(optarg, O_RDONLY)) == -1)
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xtables_error(PARAMETER_PROBLEM,
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"Couldn't open file '%s'", optarg);
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- fstat(fd, &stats);
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+ if (fstat(fd, &stats) < 0)
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+ xtables_error(PARAMETER_PROBLEM,
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+ "fstat(%s) failed: '%s'",
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+ optarg, strerror(errno));
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flen = stats.st_size;
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/* use mmap because the file will probably be big */
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optarg = mmap(0, flen, PROT_READ | PROT_WRITE,
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--
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2.24.0
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