From 75a7f8778e929104684d975e637eae01336d082d Mon Sep 17 00:00:00 2001 From: Yuezhang Mo Date: Mon, 16 Dec 2024 13:39:42 +0800 Subject: [PATCH] exfat: fix the infinite loop in __exfat_free_cluster() In __exfat_free_cluster(), the cluster chain is traversed until the EOF cluster. If the cluster chain includes a loop due to file system corruption, the EOF cluster cannot be traversed, resulting in an infinite loop. To avoid this infinite loop, this commit changes to only traverse and free the number of clusters indicated by the file size. Signed-off-by: Yuezhang Mo Suggested-by: Namjae Jeon --- fs/exfat/fatent.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c index 773c320d68f3..ab29c30ebaab 100644 --- a/fs/exfat/fatent.c +++ b/fs/exfat/fatent.c @@ -201,6 +201,8 @@ static int __exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain if (err || n_clu == EXFAT_EOF_CLUSTER) sync = true; + else if (num_clusters >= p_chain->size) + break; else next_cmap_i = BITMAP_OFFSET_SECTOR_INDEX(sb, CLUSTER_TO_BITMAP_ENT(n_clu)); -- 2.43.0