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ext4: verify dir block before splitting it
commit 46c116b upstream. Before splitting a directory block verify its directory entries are sane so that the splitting code does not access memory it should not. Cc: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20220518093332.13986-1-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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