CVE-2024-38543
Description
In the Linux kernel, the following vulnerability has been resolved: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure The kcalloc() in dmirror_device_evict_chunk() will return null if the physical memory has run out. As a result, if src_pfns or dst_pfns is dereferenced, the null pointer dereference bug will happen. Moreover, the device is going away. If the kcalloc() fails, the pages mapping a chunk could not be evicted. So add a __GFP_NOFAIL flag in kcalloc(). Finally, as there is no need to have physically contiguous memory, Switch kcalloc() to kvcalloc() in order to avoid failing allocations.
How to fix
- linux linux_kernel6.1.93, 6.6.33, 6.8.12, 6.9.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.8 ≤ v < 6.1.93, 6.2 ≤ v < 6.6.33, 6.7 ≤ v < 6.8.12, 6.9 ≤ v < 6.9.3 | 6.1.93, 6.6.33, 6.8.12, 6.9.3 |
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