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ext4: zero out the unused memory region in the extent tree block
This commit zeroes out the unused memory region in the buffer_head corresponding to the extent metablock after writing the extent header and the corresponding extent node entries. This is done to prevent random uninitialized data from getting into the filesystem when the extent block is synced. This fixes CVE-2019-11833. Signed-off-by: Sriram Rajagopalan <email@example.com> Signed-off-by: Theodore Ts'o <firstname.lastname@example.org> Cc: email@example.com
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