CVE-2022-50102
video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()
We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.
Please see our statement on Data Privacy.
video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock() 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 in: drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info->var.pixclock) / hmul); with hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0. and then in: drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par->dac, 0, 1000000000 / pixclock); we'll get a division-by-zero. The following log can reveal it: divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline] RIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784 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 ark_set_pixclock() first.
Reserved 2025-06-18 | Published 2025-06-18 | Updated 2025-06-18 | Assigner Linuxgit.kernel.org/...c/76b3f0a0b56e53a960a14624a0f48b3d94b5e7e7
git.kernel.org/...c/b9a66f23612b84617e04412169e155a4b92f632d
git.kernel.org/...c/a249e1b89ca25e1c34bdf96154e3f6224a91a9af
git.kernel.org/...c/0288fa799e273b08839037499d704dc7bdc13e9a
git.kernel.org/...c/236c1502520b7b08955467ec2e50b3232e34f1f9
git.kernel.org/...c/9ebc5031958c1f3a2795e4533b4091d77c738d14
git.kernel.org/...c/15661642511b2b192077684a89f42a8d95d54286
git.kernel.org/...c/2f1c4523f7a3aaabe7e53d3ebd378292947e95c8
Support options
