Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: make release_scratchbuffers idempotent brcmf_pcie_release_scratchbuffers() frees the shared.scratch and shared.ringupd DMA buffers with dma_free_coherent() but does not clear the pointers afterwards, unlike the sibling release_ringbuffers() which NULLs commonrings/flowrings/idxbuf on release. Both the bus_reset .reset callback (brcmf_pcie_reset) and brcmf_pcie_remove() call release_scratchbuffers. When reset teardown has run before removal, remove's own teardown would call dma_free_coherent() a second time on the already-freed DMA allocation. NULL the pointers after free, matching release_ringbuffers(), so a later release observes that the allocation has already been released. This patch makes repeated sequential release safe; the reset-work lifetime is handled separately by the following patch. This issue was found by an in-house static analysis tool.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4684997d9eea29380000e062755aa6d368d789a3 before 81c58a206d1deee01f4c29236d4154c0872f2a38; affected 4684997d9eea29380000e062755aa6d368d789a3 before 382ee00b2d1e31869ae576a60d3fbe7a2153512f; affected 4684997d9eea29380000e062755aa6d368d789a3 before 739b686aecdb14a6065300ea53401f043e51fd22; affected 4684997d9eea29380000e062755aa6d368d789a3 before b7d1d8cb1bdca56aecebacd2896615da0acc126a; affected 4684997d9eea29380000e062755aa6d368d789a3 before 5a045c2f0fbf029873d2295178fa0785ade35af0; affected 4684997d9eea29380000e062755aa6d368d789a3 before 044fca8f45ba9ab6ca526163155234cf88287ff5; affected 4684997d9eea29380000e062755aa6d368d789a3 before 0ca80328df23f851c86866720d4977783c919ee6; affected 4684997d9eea29380000e062755aa6d368d789a3 before 538c51e9d124cf656f2dd0c0394a8545efc7102d |
| Linux / Linux | affected 5.2; unaffected 0 before 5.2; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38
- https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f
- https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22
- https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a
- https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0
- https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5
- https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6
- https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d
ADP enrichment
No English description supplied.
No references supplied.