Description
In the Linux kernel, the following vulnerability has been resolved: slip: bound decode() reads against the compressed packet length slhc_uncompress() parses a VJ-compressed TCP header by advancing a pointer through the packet via decode() and pull16(). Neither helper bounds-checks against isize, and decode() masks its return with & 0xffff so it can never return the -1 that callers test for -- those error paths are dead code. A short compressed frame whose change byte requests optional fields lets decode() read past the end of the packet. The over-read bytes are folded into the cached cstate and reflected into subsequent reconstructed packets. Make decode() and pull16() take the packet end pointer and return -1 when exhausted. Add a bounds check before the TCP-checksum read. The existing == -1 tests now do what they were always meant to.
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 6268f01ae989013671b526c883e92655342c6f6f
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 9aafba2f49e1fcccc2018816f5836a609c925879
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 335957df4ed60f02a2ec0432fbedbf0cc7241d8b
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 37537e42e6df387398bee85cb85070cc80bb1e10
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 4cefe32639933d652614b0bd50f818f9af4af78f
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before d42bec6e4f6d6d658be365539400b3314b76b2a7
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7
2.6.12
Any version before 2.6.12
5.10.258 (semver)
5.15.209 (semver)
6.1.175 (semver)
6.6.141 (semver)
6.12.91 (semver)
6.18.33 (semver)
7.0.10 (semver)
7.1-rc1 (original_commit_for_fix)
References
git.kernel.org/...c/6268f01ae989013671b526c883e92655342c6f6f
git.kernel.org/...c/9aafba2f49e1fcccc2018816f5836a609c925879
git.kernel.org/...c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b
git.kernel.org/...c/37537e42e6df387398bee85cb85070cc80bb1e10
git.kernel.org/...c/4cefe32639933d652614b0bd50f818f9af4af78f
git.kernel.org/...c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d
git.kernel.org/...c/d42bec6e4f6d6d658be365539400b3314b76b2a7
git.kernel.org/...c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7