Commits
Christoph Hellwig committed d9ba842efdf
iomap: fix a use after free in iomap_dio_rw [ Upstream commit 4ea899ead2786a30aaa8181fefa81a3df4ad28f6 ] Introduce a local wait_for_completion variable to avoid an access to the potentially freed dio struture after dropping the last reference count. Also use the chance to document the completion behavior to make the refcounting clear to the reader of the code. Fixes: ff6a9292e6 ("iomap: implement direct I/O") Reported-by: Chandan Rajendra <chandan@linux.ibm.com> Reported-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Chandan Rajendra <chandan@linux.ibm.com> Tested-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>