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If anyone has any objections, please let me know. ------------------ From: Giorgi Kobakhia [ Upstream commit 6193ce7896afb52a321a0063c8b6a45e477a84e2 ] __ocfs2_find_path() walks down the extent tree and records path by calling find_path_ins(), which appends entry to path->p_node[]. It only has 5 spots. A corrupted ocfs2 image whose extent block is pointing to itself causes __ocfs2_find_path() descent endlessly, writing past the end of path->p_node[] array. UBSAN: array-index-out-of-bounds in fs/ocfs2/alloc.c:677:14 index 5 is out of range for type 'ocfs2_path_item [5]' Call Trace: find_path_ins (fs/ocfs2/alloc.c:677 fs/ocfs2/alloc.c:1914) __ocfs2_find_path.constprop.0 (fs/ocfs2/alloc.c:1882) ocfs2_commit_truncate (fs/ocfs2/alloc.c:1924 fs/ocfs2/alloc.c:7286) ocfs2_truncate_file (fs/ocfs2/file.c:515) ocfs2_setattr (fs/ocfs2/file.c:1224) notify_change (fs/attr.c:556) do_truncate (fs/open.c:68) do_ftruncate (fs/open.c:194 (discriminator 1)) ksys_ftruncate (fs/open.c:206) __x64_sys_ftruncate (fs/open.c:211 fs/open.c:209 fs/open.c:209) Commit a406aff8c051 ("ocfs2: validate l_tree_depth to avoid out-of-bounds access") already restricts el->l_tree_depth to be less than OCFS2_MAX_PATH_DEPTH, which is equal to 5. However, does not handle the infinite descent case. Check if the el->l_tree_depth decreases on each descent. Maximum descents are restricted to 4 and the path->p_node[] array does not overflow. Link: https://lore.kernel.org/20260922202159.2421642-1-gkobakhi@asu.edu Fixes: dcd0538ff4e8 ("ocfs2: sparse b-tree support") Signed-off-by: Giorgi Kobakhia Signed-off-by: Andrew Morton Tested-by: Xiang Mei Reviewed-by: Joseph Qi Assisted-by: LLM Cc: Mark Fasheh Cc: Joel Becker Cc: Signed-off-by: Sasha Levin --- fs/ocfs2/alloc.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index be09e766ac1fc..c85a472965d5b 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -1817,6 +1817,7 @@ static int __ocfs2_find_path(struct ocfs2_caching_info *ci, int i, ret = 0; u32 range; u64 blkno; + u32 prev_depth = OCFS2_MAX_PATH_DEPTH; struct buffer_head *bh = NULL; struct ocfs2_extent_block *eb; struct ocfs2_extent_list *el; @@ -1824,14 +1825,16 @@ static int __ocfs2_find_path(struct ocfs2_caching_info *ci, el = root_el; while (el->l_tree_depth) { - if (unlikely(le16_to_cpu(el->l_tree_depth) >= OCFS2_MAX_PATH_DEPTH)) { + if (unlikely(le16_to_cpu(el->l_tree_depth) >= prev_depth)) { ocfs2_error(ocfs2_metadata_cache_get_super(ci), - "Owner %llu has invalid tree depth %u in extent list\n", + "Owner %llu has invalid tree depth %u in extent list (max %u)\n", (unsigned long long)ocfs2_metadata_cache_owner(ci), - le16_to_cpu(el->l_tree_depth)); + le16_to_cpu(el->l_tree_depth), prev_depth - 1); ret = -EROFS; goto out; } + prev_depth = le16_to_cpu(el->l_tree_depth); + if (!el->l_next_free_rec || !el->l_count) { ocfs2_error(ocfs2_metadata_cache_get_super(ci), "Owner %llu has empty extent list at depth %u\n" -- 2.53.0