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.

kernel.org https://git.kernel.org/stable/c/1a21fdeea502658e315bd939409b755974f4fb64 [No types assigned]

kernel.org https://git.kernel.org/stable/c/3b20d18f475bd17309db640dbe7d7c7ebb5bc2bc [No types assigned]

kernel.org https://git.kernel.org/stable/c/65e528a69cb3ed4a286c45b4afba57461c8b5b33 [No types assigned]

kernel.org https://git.kernel.org/stable/c/c2af060d1c18beaec56351cf9c9bcbbc5af341a3 [No types assigned]

kernel.org https://git.kernel.org/stable/c/ce47e8ead9a72834cc68431d53f8092ce69bebb7 [No types assigned]