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netfilter: x_tables: assert minimum target size

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commit a08e4e190b866579896c09af59b3bdca821da2cd upstream.

The target size includes the size of the xt_entry_target struct.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Westphal 2016-04-01 14:17:25 +02:00 • committed by Greg Kroah-Hartman
parent 6bc803b795
commit ed30e07de0
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/x_tables.c
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@ -567,6 +567,9 @@ int xt_check_entry_offsets(const void *base,
return -EINVAL;
t = (void *)(e + target_offset);
if (t->u.target_size < sizeof(*t))
return -EINVAL;
if (target_offset + t->u.target_size > next_offset)
return -EINVAL;