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btrfs: propagate error to btrfs_cmp_data_prepare caller

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commit 78ad4ce014 upstream.

btrfs_cmp_data_prepare() (almost) always returns 0 i.e. ignoring errors
from gather_extent_pages(). While the pages are freed by
btrfs_cmp_data_free(), cmp->num_pages still has > 0. Then,
btrfs_extent_same() try to access the already freed pages causing faults
(or violates PageLocked assertion).

This patch just return the error as is so that the caller stop the process.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Fixes: f441460202 ("btrfs: fix deadlock with extent-same and readpage")
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naohiro Aota
2017-09-08 17:48:55 +09:00
committed by Greg Kroah-Hartman
parent 9a7d93dd2c
commit 0efde43517
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ioctl.c
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@@ -2984,7 +2984,7 @@ static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
out:
if (ret)
btrfs_cmp_data_free(cmp);
return 0;
return ret;
}
static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,