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btrfs: send: handle path ref underflow in header iterate_inode_ref()

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[ Upstream commit 3c6ee34c6f9cd12802326da26631232a61743501 ]

Change BUG_ON to proper error handling if building the path buffer
fails. The pointers are not printed so we don't accidentally leak kernel
addresses.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Sterba 2024-02-06 22:47:13 +01:00 committed by Greg Kroah-Hartman
parent 0002df7380
commit 4720d590c4
1 changed files with 9 additions and 1 deletions
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10
fs/btrfs/send.c
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@ -966,7 +966,15 @@ static int iterate_inode_ref(struct btrfs_root *root, struct btrfs_path *path,
ret = PTR_ERR(start);
goto out;
}
BUG_ON(start < p->buf);
if (unlikely(start < p->buf)) {
btrfs_err(root->fs_info,
"send: path ref buffer underflow for key (%llu %u %llu)",
found_key->objectid,
found_key->type,
found_key->offset);
ret = -EINVAL;
goto out;
}
}
p->start = start;
} else {