From: Yuezhang Mo Date: Sat, 8 Feb 2025 09:16:58 +0000 (+0800) Subject: exfat: add a check for invalid data size X-Git-Tag: v6.14-rc6~28^2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=13940cef95491472760ca261b6713692ece9b946;p=linux-block.git exfat: add a check for invalid data size Add a check for invalid data size to avoid corrupted filesystem from being further corrupted. Signed-off-by: Yuezhang Mo Signed-off-by: Namjae Jeon --- diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index 5b16181a4c2e..8b30027d8251 100644 --- a/fs/exfat/namei.c +++ b/fs/exfat/namei.c @@ -646,6 +646,11 @@ static int exfat_find(struct inode *dir, struct qstr *qname, info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size); info->size = le64_to_cpu(ep2->dentry.stream.size); + if (unlikely(EXFAT_B_TO_CLU_ROUND_UP(info->size, sbi) > sbi->used_clusters)) { + exfat_fs_error(sb, "data size is invalid(%lld)", info->size); + return -EIO; + } + info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu); if (!is_valid_cluster(sbi, info->start_clu) && info->size) { exfat_warn(sb, "start_clu is invalid cluster(0x%x)",