CVE-2023-52811: scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool
First published: Tue May 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool In practice the driver should never send more commands than are allocated to a queue's event pool. In the unlikely event that this happens, the code asserts a BUG_ON, and in the case that the kernel is not configured to crash on panic returns a junk event pointer from the empty event list causing things to spiral from there. This BUG_ON is a historical artifact of the ibmvfc driver first being upstreamed, and it is well known now that the use of BUG_ON is bad practice except in the most unrecoverable scenario. There is nothing about this scenario that prevents the driver from recovering and carrying on. Remove the BUG_ON in question from ibmvfc_get_event() and return a NULL pointer in the case of an empty event pool. Update all call sites to ibmvfc_get_event() to check for a NULL pointer and perfrom the appropriate failure or recovery action.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.15.140 | 5.15.140 |
| redhat/kernel | <6.1.64 | 6.1.64 |
| redhat/kernel | <6.5.13 | 6.5.13 |
| redhat/kernel | <6.6.3 | 6.6.3 |
| redhat/kernel | <6.7 | 6.7 |
| Linux Kernel | <5.15.140 | |
| Linux Kernel | >=5.16<6.1.64 | |
| Linux Kernel | >=6.2<6.5.13 | |
| Linux Kernel | >=6.6<6.6.3 |
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Reference Links
- https://git.kernel.org/stable/c/88984ec4792766df5a9de7a2ff2b5f281f94c7d4
- https://git.kernel.org/stable/c/8bbe784c2ff28d56ca0c548aaf3e584edc77052d
- https://git.kernel.org/stable/c/b39f2d10b86d0af353ea339e5815820026bca48f
- https://git.kernel.org/stable/c/d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8
- https://git.kernel.org/stable/c/e1d1f79b1929dce470a5dc9281c574cd58e8c6c0
- https://access.redhat.com/security/cve/CVE-2023-52811
- https://lore.kernel.org/linux-cve-announce/2024052102-CVE-2023-52811-2a5f@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:4823
- https://access.redhat.com/errata/RHSA-2024:4831
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:6993
- https://access.redhat.com/errata/RHSA-2024:9315
- https://access.redhat.com/errata/RHSA-2024:10771
- https://bugzilla.redhat.com/show_bug.cgi?id=2282743
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