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ipv6: Fix out-of-bounds access in ipv6_find_tlv()

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commit 878ecb0897f4737a4c9401f3523fd49589025671 upstream.

optlen is fetched without checking whether there is more than one byte to parse.
It can lead to out-of-bounds access.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: c61a40432509 ("[IPV6]: Find option offset by type.")
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gavrilov Ilia 2023-05-23 08:29:44 +00:00 committed by Greg Kroah-Hartman
parent 9bc1dbfd91
commit 91dd8aab9c
1 changed files with 2 additions and 0 deletions
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2
net/ipv6/exthdrs_core.c
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@ -143,6 +143,8 @@ int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type)
optlen = 1; optlen = 1;
break; break;
default: default:
if (len < 2)
goto bad;
optlen = nh[offset + 1] + 2; optlen = nh[offset + 1] + 2;
if (optlen > len) if (optlen > len)
goto bad; goto bad;