Description
In the Linux kernel, the following vulnerability has been resolved: comedi: fix divide-by-zero in comedi_buf_munge() The comedi_buf_munge() function performs a modulo operation `async->munge_chan %= async->cmd.chanlist_len` without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path. Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging. This prevents potential kernel panics from malformed user commands.
Product status
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 4ffea48c69cb2b96a281cb7e5e42d706996631db
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 2670932f2465793fea1ef073e40883e8390fa4d9
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 6db19822512396be1a3e1e20c16c97270285ba1a
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before d4854eff25efb06d0d84c13e7129bbdba4125f8c
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before a4bb5d1bc2f238461bcbe5303eb500466690bb2c
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 55520f65fd447e04099a2c44185453c18ea73b7e
ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 87b318ba81dda2ee7b603f4f6c55e78ec3e95974
2.6.29
Any version before 2.6.29
5.4.301 (semver)
5.10.246 (semver)
5.15.196 (semver)
6.1.158 (semver)
6.6.115 (semver)
6.12.56 (semver)
6.17.6 (semver)
6.18 (original_commit_for_fix)
References
git.kernel.org/...c/4ffea48c69cb2b96a281cb7e5e42d706996631db
git.kernel.org/...c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c
git.kernel.org/...c/2670932f2465793fea1ef073e40883e8390fa4d9
git.kernel.org/...c/6db19822512396be1a3e1e20c16c97270285ba1a
git.kernel.org/...c/d4854eff25efb06d0d84c13e7129bbdba4125f8c
git.kernel.org/...c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c
git.kernel.org/...c/55520f65fd447e04099a2c44185453c18ea73b7e
git.kernel.org/...c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974