thunderbolt: Fix NULL pointer dereference in tb_port_update_credits()
Description
In the Linux kernel, the following vulnerability has been resolved:
thunderbolt: Fix NULL pointer dereference in tb_port_update_credits()
Olliver reported that his system crashes when plugging in Thunderbolt 1 device:
BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:tb_port_do_update_credits+0x1b/0x130 [thunderbolt] Call Trace:
? __die+0x23/0x70 ? page_fault_oops+0x171/0x4e0 ? exc_page_fault+0x7f/0x180 ? asm_exc_page_fault+0x26/0x30 ? tb_port_do_update_credits+0x1b/0x130 ? tb_switch_update_link_attributes+0x83/0xd0 tb_switch_add+0x7a2/0xfe0 tb_scan_port+0x236/0x6f0 tb_handle_hotplug+0x6db/0x900 process_one_work+0x171/0x340 worker_thread+0x27b/0x3a0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe5/0x120 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x31/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30
This is due the fact that some Thunderbolt 1 devices only have one lane adapter. Fix this by checking for the lane 1 before we read its credits.
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Affected products
8- Range: <6.9-rc7
- osv-coords6 versionspkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0
< 6.4.0-17.1.1.51+ 5 more
- (no CPE)range: < 6.4.0-17.1.1.51
- (no CPE)range: < 6.4.0-18.1
- (no CPE)range: < 6.4.0-18.1
- (no CPE)range: < 6.4.0-9.1
- (no CPE)range: < 6.4.0-18.1
- (no CPE)range: < 6.4.0-9.1
Patches
Vulnerability mechanics
References
3News mentions
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