Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: altmodes/displayport: fix pin_assignment_show This patch fixes negative indexing of buf array in pin_assignment_show when get_current_pin_assignments returns 0 i.e. no compatible pin assignments are found. BUG: KASAN: use-after-free in pin_assignment_show+0x26c/0x33c ... Call trace: dump_backtrace+0x110/0x204 dump_stack_lvl+0x84/0xbc print_report+0x358/0x974 kasan_report+0x9c/0xfc __do_kernel_fault+0xd4/0x2d4 do_bad_area+0x48/0x168 do_tag_check_fault+0x24/0x38 do_mem_abort+0x6c/0x14c el1_abort+0x44/0x68 el1h_64_sync_handler+0x64/0xa4 el1h_64_sync+0x78/0x7c pin_assignment_show+0x26c/0x33c dev_attr_show+0x50/0xc0

References 7

• git.kernel.org https://git.kernel.org/stable/c/08bd1be1c716fd50a7df48f82dcbc59a103082b5
• git.kernel.org https://git.kernel.org/stable/c/0e61a7432fcd4bca06f05b7f1c7d7cb461880fe2
• git.kernel.org https://git.kernel.org/stable/c/4f9c0a7c272626cb6716ffc7800e8c73260cdce6
• git.kernel.org https://git.kernel.org/stable/c/54ee23e4ab263a495ace1eed43d3883212ece17f
• git.kernel.org https://git.kernel.org/stable/c/d8f28269dd4bf9b55c3fb376ae31512730a96fce
• git.kernel.org https://git.kernel.org/stable/c/fc0e18f95c88435bd8a1ceb540243cd7fbcd9781
• git.kernel.org https://git.kernel.org/stable/c/ff466f77d0a56719979c4234abd412abd98eae8f

Remediation