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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: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Yuezhang Mo 2025-02-08 17:16:58 +08:00 committed by Namjae Jeon
parent fda94a9919
commit 13940cef95
1 changed files with 5 additions and 0 deletions
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5
fs/exfat/namei.c
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@ -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->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size);
info->size = le64_to_cpu(ep2->dentry.stream.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); info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu);
if (!is_valid_cluster(sbi, info->start_clu) && info->size) { if (!is_valid_cluster(sbi, info->start_clu) && info->size) {
exfat_warn(sb, "start_clu is invalid cluster(0x%x)", exfat_warn(sb, "start_clu is invalid cluster(0x%x)",