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authorSriram Rajagopalan <sriramr@arista.com>2019-05-10 19:28:06 -0400
committerTheodore Ts'o <tytso@mit.edu>2019-05-10 19:28:06 -0400
commit592acbf16821288ecdc4192c47e3774a4c48bb64 (patch)
tree1b196247f70faa977aafc443bf57ecedd4490503 /fs/jbd2
parentdb90f41916cf04c020062f8d8b0385942248283e (diff)
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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 <sriramr@arista.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
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