btrfs: avoid NULL deref in btrfs_reserve_extent with DEBUG_ENOSPC
__find_space_info can return NULL but we don't check it before calling
dump_space_info().
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 37e0a80..c32a9bf 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5838,7 +5838,8 @@
printk(KERN_ERR "btrfs allocation failed flags %llu, "
"wanted %llu\n", (unsigned long long)data,
(unsigned long long)num_bytes);
- dump_space_info(sinfo, num_bytes, 1);
+ if (sinfo)
+ dump_space_info(sinfo, num_bytes, 1);
}
}