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authorZhao Lei <zhaolei@cn.fujitsu.com>2016-05-17 17:37:38 +0800
committerDavid Sterba <dsterba@suse.com>2016-05-25 22:15:21 +0200
commitf1fee6534dcfbf468a159789aa202db2bce8c200 (patch)
tree4149ed8954a0c344b354769d1c9bbed9a8e54114 /fs/btrfs/scrub.c
parent2d324f59f343967a03eeb2690f0ff178304d0687 (diff)
btrfs: scrub: Set bbio to NULL before calling btrfs_map_block
We usually call btrfs_put_bbio() when btrfs_map_block() failed, btrfs_put_bbio() works right whether bbio is a valid value, or NULL. But there is a exception, in some case, btrfs_map_block() will return fail without touching *bbio(keeping its original value), and if bbio was not initialized yet, invalid memory accessing will happened. Above case is in scrub_missing_raid56_pages(), and similar case in scrub_raid56_parity(). Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/scrub.c')
-rw-r--r--fs/btrfs/scrub.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index fa35cdc46494..ab3b9d604919 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -2181,7 +2181,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
u64 length = sblock->page_count * PAGE_SIZE;
u64 logical = sblock->pagev[0]->logical;
- struct btrfs_bio *bbio;
+ struct btrfs_bio *bbio = NULL;
struct bio *bio;
struct btrfs_raid_bio *rbio;
int ret;
@@ -2982,6 +2982,7 @@ again:
extent_len);
mapped_length = extent_len;
+ bbio = NULL;
ret = btrfs_map_block(fs_info, READ, extent_logical,
&mapped_length, &bbio, 0);
if (!ret) {