Description
In the Linux kernel, the following vulnerability has been resolved: l2tp: pass correct message length to ip6_append_data l2tp_ip6_sendmsg needs to avoid accounting for the transport header twice when splicing more data into an already partially-occupied skbuff. To manage this, we check whether the skbuff contains data using skb_queue_empty when deciding how much data to append using ip6_append_data. However, the code which performed the calculation was incorrect: ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0; ...due to C operator precedence, this ends up setting ulen to transhdrlen for messages with a non-zero length, which results in corrupted packets on the wire. Add parentheses to correct the calculation in line with the original intent.
Product status
559d697c5d072593d22b3e0bd8b8081108aeaf59 (git) before 4c3ce64bc9d36ca9164dd6c77ff144c121011aae
1fc793d68d50dee4782ef2e808913d5dd880bcc6 (git) before c1d3a84a67db910ce28a871273c992c3d7f9efb5
96b2e1090397217839fcd6c9b6d8f5d439e705ed (git) before dcb4d14268595065c85dc5528056713928e17243
cd1189956393bf850b2e275e37411855d3bd86bb (git) before 0da15a70395182ee8cb75716baf00dddc0bea38d
f6a7182179c0ed788e3755ee2ed18c888ddcc33f (git) before 13cd1daeea848614e585b2c6ecc11ca9c8ab2500
9d4c75800f61e5d75c1659ba201b6c0c7ead3070 (git) before 804bd8650a3a2bf3432375f8c97d5049d845ce56
9d4c75800f61e5d75c1659ba201b6c0c7ead3070 (git) before 83340c66b498e49353530e41542500fc8a4782d6
9d4c75800f61e5d75c1659ba201b6c0c7ead3070 (git) before 359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
7626b9fed53092aa2147978070e610ecb61af844 (git)
fe80658c08e3001c80c5533cd41abfbb0e0e28fd (git)
6.6
Any version before 6.6
4.19.308 (semver)
5.4.270 (semver)
5.10.211 (semver)
5.15.150 (semver)
6.1.80 (semver)
6.6.19 (semver)
6.7.7 (semver)
6.8 (original_commit_for_fix)
References
git.kernel.org/...c/4c3ce64bc9d36ca9164dd6c77ff144c121011aae
git.kernel.org/...c/c1d3a84a67db910ce28a871273c992c3d7f9efb5
git.kernel.org/...c/dcb4d14268595065c85dc5528056713928e17243
git.kernel.org/...c/0da15a70395182ee8cb75716baf00dddc0bea38d
git.kernel.org/...c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500
git.kernel.org/...c/804bd8650a3a2bf3432375f8c97d5049d845ce56
git.kernel.org/...c/83340c66b498e49353530e41542500fc8a4782d6
git.kernel.org/...c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
lists.debian.org/debian-lts-announce/2024/06/msg00017.html
lists.debian.org/debian-lts-announce/2024/06/msg00020.html
git.kernel.org/...c/4c3ce64bc9d36ca9164dd6c77ff144c121011aae
git.kernel.org/...c/c1d3a84a67db910ce28a871273c992c3d7f9efb5
git.kernel.org/...c/dcb4d14268595065c85dc5528056713928e17243
git.kernel.org/...c/0da15a70395182ee8cb75716baf00dddc0bea38d
git.kernel.org/...c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500
git.kernel.org/...c/804bd8650a3a2bf3432375f8c97d5049d845ce56
git.kernel.org/...c/83340c66b498e49353530e41542500fc8a4782d6
git.kernel.org/...c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
