Commit c17acd24 authored Apr 07, 2017 by Liu Bo Committed by Greg Kroah-Hartman Oct 08, 2017

Btrfs: fix segmentation fault when doing dio read




[ Upstream commit 97bf5a5589aa3a59c60aa775fc12ec0483fc5002 ]

Commit 2dabb324 ("Btrfs: Direct I/O read: Work on sectorsized blocks")
introduced this bug during iterating bio pages in dio read's endio hook,
and it could end up with segment fault of the dio reading task.

So the reason is 'if (nr_sectors--)', and it makes the code assume that
there is one more block in the same page, so page offset is increased and
the bio which is created to repair the bad block then has an incorrect
bvec.bv_offset, and a later access of the page content would throw a
segmentation fault.

This also adds ASSERT to check page offset against page size.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 7e2a7554

fs/btrfs/inode.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -8050,8 +8050,10 @@ static int __btrfs_correct_data_nocsum(struct inode *inode,

		start += sectorsize;

		if (nr_sectors--) {
		nr_sectors--;
		if (nr_sectors) {
		pgoff += sectorsize;
		ASSERT(pgoff < PAGE_SIZE);
		goto next_block_or_try_again;
		}
		}
		@@ -8157,8 +8159,10 @@ static int __btrfs_subio_endio_read(struct inode *inode,

		ASSERT(nr_sectors);

		if (--nr_sectors) {
		nr_sectors--;
		if (nr_sectors) {
		pgoff += sectorsize;
		ASSERT(pgoff < PAGE_SIZE);
		goto next_block;
		}
		}