CVE-2022-48945

In the Linux kernel, the following vulnerability has been resolved:

media: vivid: fix compose size exceed boundary

syzkaller found a bug:

BUG: unable to handle page fault for address: ffffc9000a3b1000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 100000067 P4D 100000067 PUD 10015f067 PMD 1121ca067 PTE 0 Oops: 0002 [#1] PREEMPT SMP CPU: 0 PID: 23489 Comm: vivid-000-vid-c Not tainted 6.1.0-rc1+ #512 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:memcpy_erms+0x6/0x10 […] Call Trace: ? tpg_fill_plane_buffer+0x856/0x15b0 vivid_fillbuff+0x8ac/0x1110 vivid_thread_vid_cap_tick+0x361/0xc90 vivid_thread_vid_cap+0x21a/0x3a0 kthread+0x143/0x180 ret_from_fork+0x1f/0x30

This is because we forget to check boundary after adjust compose->height int V4L2_SEL_TGT_CROP case. Add v4l2_rect_map_inside() to fix this problem for this case.

Affected Software

References

• https://git.kernel.org/stable/c/2f558c5208b0f70c8140e08ce09fcc84da48e789
• https://git.kernel.org/stable/c/54f259906039dbfe46c550011409fa16f72370f6
• https://git.kernel.org/stable/c/5edc3604151919da8da0fb092b71d7dce07d848a
• https://git.kernel.org/stable/c/8c0ee15d9a102c732d0745566d254040085d5663
• https://git.kernel.org/stable/c/94a7ad9283464b75b12516c5512541d467cefcf8
• https://git.kernel.org/stable/c/9c7fba9503b826f0c061d136f8f0c9f953ed18b9
• https://git.kernel.org/stable/c/ab54081a2843aefb837812fac5488cc8f1696142
• https://git.kernel.org/stable/c/ccb5392c4fea0e7d9f7ab35567e839d74cb3998b
• https://git.kernel.org/stable/c/f9d19f3a044ca651b0be52a4bf951ffe74259b9f