Commit 13940cef authored by Yuezhang Mo's avatar Yuezhang Mo Committed by Namjae Jeon
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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: default avatarYuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
parent fda94a99

fs/exfat/namei.c

+5 −0
Original line number Diff line number Diff line
@@ -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)",