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s390/zcore: fix race when reading from hardware system area
[ Upstream commit 9ffed25 ] Memory buffer used for reading out data from hardware system area is not protected against concurrent access. Reported-by: Matthew Wilcox <[email protected]> Fixes: 411ed32 ("[S390] zfcpdump support.") Acked-by: Heiko Carstens <[email protected]> Tested-by: Alexander Egorenkov <[email protected]> Link: https://lore.kernel.org/r/e68137f0f9a0d2558f37becc20af18e2939934f6.1658206891.git.agordeev@linux.ibm.com Signed-off-by: Alexander Gordeev <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
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