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| author | Naohiro Aota <naohiro.aota@wdc.com> | 2017-09-08 17:48:55 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-05 09:41:47 +0200 |
| commit | 0efde43517a54007c4b19a72d9e3da8a0199074e (patch) | |
| tree | ae7de4e1d42732e83182864108b261615a4cdf7c /fs | |
| parent | 9a7d93dd2cadf532e5a7c490e05c55d44ea4e583 (diff) | |
| download | linux-stable-0efde43517a54007c4b19a72d9e3da8a0199074e.tar.gz linux-stable-0efde43517a54007c4b19a72d9e3da8a0199074e.tar.bz2 linux-stable-0efde43517a54007c4b19a72d9e3da8a0199074e.zip | |
btrfs: propagate error to btrfs_cmp_data_prepare caller
commit 78ad4ce014d025f41b8dde3a81876832ead643cf 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: f441460202cb ("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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 317b99acdf4b..be43d1c5b5fb 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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, |