From: Liu Bo Date: Fri, 7 Apr 2017 20:11:10 +0000 (-0700) Subject: Btrfs: fix segmentation fault when doing dio read X-Git-Tag: v4.11-rc7~17^2~1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=97bf5a5589aa3a59c60aa775fc12ec0483fc5002;p=karo-tx-linux.git Btrfs: fix segmentation fault when doing dio read Commit 2dabb3248453 ("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 Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 388c6ce069de..55ed2c4829a8 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7972,8 +7972,10 @@ next_block_or_try_again: start += sectorsize; - if (nr_sectors--) { + nr_sectors--; + if (nr_sectors) { pgoff += sectorsize; + ASSERT(pgoff < PAGE_SIZE); goto next_block_or_try_again; } } @@ -8074,8 +8076,10 @@ next: ASSERT(nr_sectors); - if (--nr_sectors) { + nr_sectors--; + if (nr_sectors) { pgoff += sectorsize; + ASSERT(pgoff < PAGE_SIZE); goto next_block; } }