video: fbdev: s3fb: Check the size of screen before memset_io()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: video: fbdev: s3fb: Check the size of screen before memset_io() In the function s3fb_set_par(), the value of 'screen_size' is calculated by the user input. If the user provides the improper value, the value of 'screen_size' may larger than 'info->screen_size', which may cause the following bug: [ 54.083733] BUG: unable to handle page fault for address: ffffc90003000000 [ 54.083742] #PF: supervisor write access in kernel mode [ 54.083744] #PF: error_code(0x0002) - not-present page [ 54.083760] RIP: 0010:memset_orig+0x33/0xb0 [ 54.083782] Call Trace: [ 54.083788] s3fb_set_par+0x1ec6/0x4040 [ 54.083806] fb_set_var+0x604/0xeb0 [ 54.083836] do_fb_ioctl+0x234/0x670 Fix the this by checking the value of 'screen_size' before memset_io().

References

• https://git.kernel.org/stable/c/574912261528589012b61f82d368256247c3a5a8
• https://git.kernel.org/stable/c/3c35a0dc2b4e7acf24c796043b64fa3eee799239
• https://git.kernel.org/stable/c/eacb50f1733660911827d7c3720f4c5425d0cdda
• https://git.kernel.org/stable/c/5e0da18956d38e7106664dc1d06367b22f06edd3
• https://git.kernel.org/stable/c/ce50d94afcb8690813c5522f24cd38737657db81
• https://git.kernel.org/stable/c/52461d387cc8c8f8dc40320caa2e9e101f73e7ba
• https://git.kernel.org/stable/c/e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0
• https://git.kernel.org/stable/c/6ba592fa014f21f35a8ee8da4ca7b95a018f13e8