ipv6: avoid overflow of offset in ip6_find_1stfragopt

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[ Upstream commit 6399f1fae4 ]

In some cases, offset can overflow and can cause an infinite loop in
ip6_find_1stfragopt(). Make it unsigned int to prevent the overflow, and
cap it at IPV6_MAXPLEN, since packets larger than that should be invalid.

This problem has been here since before the beginning of git history.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Sabrina Dubroca 2017-07-19 22:28:55 +02:00 • committed by Greg Kroah-Hartman

parent 0b83249a57

commit 4a2ffe1707

1 changed files with 6 additions and 2 deletions

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net/ipv6/output_core.c

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