diff options
| author | Duoming Zhou <duoming@zju.edu.cn> | 2024-03-12 03:59:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-30 10:49:45 +0300 |
| commit | ce47e8ead9a72834cc68431d53f8092ce69bebb7 (patch) | |
| tree | 8dc8cb1d8752e8691c142049e6ef2b33aa3c885b /include/linux/hw_random.h | |
| parent | 264dd6fe25b64e5189bd8a2151d24e205b02d927 (diff) | |
| download | linux-ce47e8ead9a72834cc68431d53f8092ce69bebb7.tar.xz | |
lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure
[ Upstream commit c2af060d1c18beaec56351cf9c9bcbbc5af341a3 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux/hw_random.h')
0 files changed, 0 insertions, 0 deletions