btrfs: avoid null pointer dereference on fs_info when calling btrfs_crit

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commit 3993b112da upstream.

There are checks on fs_info in __btrfs_panic to avoid dereferencing a
null fs_info, however, there is a call to btrfs_crit that may also
dereference a null fs_info. Fix this by adding a check to see if fs_info
is null and only print the s_id if fs_info is non-null.

Detected by CoverityScan CID#401973 ("Dereference after null check")

Fixes: efe120a067 ("Btrfs: convert printk to btrfs_ and fix BTRFS prefix")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Colin Ian King 2017-09-11 16:15:28 +01:00 • committed by Ben Hutchings

parent fabb6fc84b

commit 0ef08ec1c2

1 changed files with 2 additions and 2 deletions

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fs/btrfs/super.c

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