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>
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@ -5838,7 +5838,8 @@ again:
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printk(KERN_ERR "btrfs allocation failed flags %llu, "
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printk(KERN_ERR "btrfs allocation failed flags %llu, "
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"wanted %llu\n", (unsigned long long)data,
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"wanted %llu\n", (unsigned long long)data,
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(unsigned long long)num_bytes);
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(unsigned long long)num_bytes);
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dump_space_info(sinfo, num_bytes, 1);
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if (sinfo)
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dump_space_info(sinfo, num_bytes, 1);
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}
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}
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}
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}
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