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btrfs: fix uninitialized parent in insert_state

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I don't know how this isn't caught when we build this in the kernel, but
while syncing extent-io-tree.c into btrfs-progs I got an error because
parent could potentially be uninitialized when we link in a new node,
specifically when the extent_io_tree is empty.  This means we could have
garbage in the parent color.  I don't know what the ramifications are of
that, but it's probably not great, so fix this by initializing parent to
NULL.  I spot checked all of our other usages in btrfs and we appear to
be doing the correct thing everywhere else.

Fixes: c7e118cf98c7 ("btrfs: open code rbtree search in insert_state")
CC: stable@vger.kernel.org # 6.0+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-11-18 15:06:09 -05:00 committed by David Sterba
parent a4c853af0c
commit d7c9e1be28
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent-io-tree.c
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@ -395,7 +395,7 @@ static int insert_state(struct extent_io_tree *tree,
u32 bits, struct extent_changeset *changeset)
{
struct rb_node **node;
struct rb_node *parent;
struct rb_node *parent = NULL;
const u64 end = state->end;
set_state_bits(tree, state, bits, changeset);