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btrfs: avoid NULL deref in btrfs_reserve_extent with DEBUG_ENOSPC

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__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>
This commit is contained in:
Jeff Mahoney 2012-03-01 14:56:28 +01:00 committed by David Sterba
parent d5c13f927f
commit 538042801a
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent-tree.c
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@ -5838,7 +5838,8 @@ again:
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);
}
}