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net: ipv6: check for validity before dereferencing cfg->fc_nlinfo.nlh

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commit 864db232dc upstream.

nlh is being checked for validtity two times when it is dereferenced in
this function. Check for validity again when updating the flags through
nlh pointer to make the dereferencing safe.

CC: <stable@vger.kernel.org>
Addresses-Coverity: ("NULL pointer dereference")
Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Muhammad Usama Anjum
2021-04-09 03:01:29 +05:00
committed by Greg Kroah-Hartman
parent af48f1856d
commit ff5eb74b7b
1 changed files with 5 additions and 3 deletions
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8
net/ipv6/route.c
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@@ -3069,9 +3069,11 @@ static int ip6_route_multipath_add(struct fib6_config *cfg)
* nexthops have been replaced by first new, the rest should
* be added to it.
*/
cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
NLM_F_REPLACE);
cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
if (cfg->fc_nlinfo.nlh) {
cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
NLM_F_REPLACE);
cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
}
nhn++;
}