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authorDuoming Zhou <duoming@zju.edu.cn>2024-03-12 08:59:05 +0800
committerAndrew Morton <akpm@linux-foundation.org>2024-04-25 20:55:48 -0700
commitc2af060d1c18beaec56351cf9c9bcbbc5af341a3 (patch)
tree6e56ef09b824bbd3bdeffa411e1b6bf15d9d6bc0 /mm
parent4196b48ddd382419e51658bf94a25af195ba9450 (diff)
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. Link: https://lkml.kernel.org/r/20240312005905.9939-1-duoming@zju.edu.cn Fixes: b2ef9f5a5cb3 ("mm/hmm/test: add selftest driver for HMM") Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Cc: Jérôme Glisse <jglisse@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
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