diff options
| author | Yuezhang Mo <Yuezhang.Mo@sony.com> | 2025-02-08 17:16:58 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:39:30 +0200 |
| commit | 92075758782c5edb4c67d0da9e47586a624c22f7 (patch) | |
| tree | 43acce9ebfd65f2643d2d668fd4ef3a385a93772 | |
| parent | 77a5ed6b0349f34ec9a3a7d1a668f7e0a28afcfc (diff) | |
exfat: add a check for invalid data size
[ Upstream commit 13940cef95491472760ca261b6713692ece9b946 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/exfat/namei.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index e47a5ddfc79b..7b3951951f8a 100644 --- a/fs/exfat/namei.c +++ b/fs/exfat/namei.c @@ -639,6 +639,11 @@ 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)", |