Commit 45f49bce authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: avoid NULL pointer deref in try_release_extent_buffer



If we fail to find a pointer in the radix tree, don't try
to deref the NULL one we do have.
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent a1b075d2
......@@ -3837,8 +3837,10 @@ int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page)
spin_lock(&tree->buffer_lock);
eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT);
if (!eb)
goto out;
if (!eb) {
spin_unlock(&tree->buffer_lock);
return ret;
}
if (test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
ret = 0;
......
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