From: Jordy Zomer <jordyzomer@google.com> mainline inclusion from mainline-v6.10-rc2 commit fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAPD CVE: CVE-2024-56627 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- An offset from client could be a negative value, It could lead to an out-of-bounds read from the stream_buf. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf. Cc: stable@vger.kernel.org # v5.15+ Reported-by: Jordy Zomer <jordyzomer@google.com> Signed-off-by: Jordy Zomer <jordyzomer@google.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> Conflicts: fs/ksmbd/smb2pdu.c fs/smb/server/smb2pdu.c [Conflicts due to ksmbd rename to smb/server] Signed-off-by: Long Li <leo.lilong@huawei.com> --- fs/ksmbd/smb2pdu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index f104de64493b..b6194837028a 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -6319,6 +6319,10 @@ int smb2_read(struct ksmbd_work *work) } offset = le64_to_cpu(req->Offset); + if (offset < 0) { + err = -EINVAL; + goto out; + } length = le32_to_cpu(req->Length); mincount = le32_to_cpu(req->MinimumCount); -- 2.39.2