Description
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: cirrusfb: check pixclock to avoid divide by zero Do a sanity check on pixclock value to avoid divide by zero. If the pixclock value is zero, the cirrusfb driver will round up pixclock to get the derived frequency as close to maxclock as possible. Syzkaller reported a divide error in cirrusfb_check_pixclock. divide error: 0000 [#1] SMP KASAN PTI CPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2 RIP: 0010:cirrusfb_check_var+0x6f1/0x1260 Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c656d04247a2654ede5cead2ecbf83431dad5261affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 40b13e3d85744210db13457785646634e2d056bdaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 53a2088a396cfa1da92690a1da289634cd73bf0daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8c7e2141fb89c620ab4e41512e262fbf25b8260daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6fe23ff94e7840097202e85c148688940b37c9b1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 45800c42ef000f417270bcfc08630e42486fca99affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e498b504f8c81b07efab9febf8503448de4dc9cfaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5c6f402bdcf9e7239c6bc7087eda71ac99b31379affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected4.9.311 to ≤ 4.9.*unaffected4.14.276 to ≤ 4.14.*unaffected4.19.238 to ≤ 4.19.*unaffected5.4.189 to ≤ 5.4.*unaffected5.10.110 to ≤ 5.10.*unaffected5.15.33 to ≤ 5.15.*unaffected5.16.19 to ≤ 5.16.*unaffected5.17.2 to ≤ 5.17.*unaffected5.18 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261 ↗
- https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135 ↗
- https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd ↗
- https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d ↗
- https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d ↗
- https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1 ↗
- https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99 ↗
- https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf ↗
- https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379 ↗