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authorNaohiro Aota <naohiro.aota@wdc.com>2017-09-08 17:48:55 +0900
committerDavid Sterba <dsterba@suse.com>2017-09-26 14:52:31 +0200
commit78ad4ce014d025f41b8dde3a81876832ead643cf (patch)
tree902bf4b9ff9285500a6ff8b00a608c21395ed655 /fs
parent6d6d282932d1a609e60dc4467677e0e863682f57 (diff)
btrfs: propagate error to btrfs_cmp_data_prepare caller
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") Cc: <stable@vger.kernel.org> # 4.2 Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ioctl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d4a77993e52f..802df5755cd3 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3028,7 +3028,7 @@ 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(u64 len, struct cmp_pages *cmp)