Description
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: i740fb: Check the argument of i740_calc_vclk() Since the user can control the arguments of the ioctl() from the user space, under special arguments that may result in a divide-by-zero bug. If the user provides an improper 'pixclock' value that makes the argumet of i740_calc_vclk() less than 'I740_RFREQ_FIX', it will cause a divide-by-zero bug in: drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX))); The following log can reveal it: divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline] RIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline] RIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742 Call Trace: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189 Fix this by checking the argument of i740_calc_vclk() first.
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
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < 59cefb583c984c0da8cf21a4c57d26d5a20dff5caffected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < 656689cb03ada4650016c153346939a1c334b1aeaffected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < d2d375eb68b4b8de6ea7460483a26fa9de56b443affected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < 2b7f559152a33c55f51b569b22efbe5e24886798affected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < 4b20c61365140d432dee7da7aa294215e7b900d9affected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < e740e787f06671455b59d1e498c9945f7b4e7b3baffected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < f350812e2d15278f1d867eeb997407782234fb3caffected5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to < 40bf722f8064f50200b8c4f8946cd625b441dda9affected
Linux Linux
Default version status: affected
3.4affected0 to < 3.4unaffected4.9.326 to ≤ 4.9.*unaffected4.14.291 to ≤ 4.14.*unaffected4.19.256 to ≤ 4.19.*unaffected5.4.211 to ≤ 5.4.*unaffected5.10.138 to ≤ 5.10.*unaffected5.15.63 to ≤ 5.15.*unaffected5.19.4 to ≤ 5.19.*unaffected6.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/59cefb583c984c0da8cf21a4c57d26d5a20dff5c ↗
- https://git.kernel.org/stable/c/656689cb03ada4650016c153346939a1c334b1ae ↗
- https://git.kernel.org/stable/c/d2d375eb68b4b8de6ea7460483a26fa9de56b443 ↗
- https://git.kernel.org/stable/c/2b7f559152a33c55f51b569b22efbe5e24886798 ↗
- https://git.kernel.org/stable/c/4b20c61365140d432dee7da7aa294215e7b900d9 ↗
- https://git.kernel.org/stable/c/e740e787f06671455b59d1e498c9945f7b4e7b3b ↗
- https://git.kernel.org/stable/c/f350812e2d15278f1d867eeb997407782234fb3c ↗
- https://git.kernel.org/stable/c/40bf722f8064f50200b8c4f8946cd625b441dda9 ↗