From: Yang Xiongwei yangxiongwei6@huawei.com

mainline inclusion from mainline-v6.9-rc4 commit 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9L4XI CVE: CVE-2024-26936

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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The response buffer should be allocated in smb2_allocate_rsp_buf before validating request. But the fields in payload as well as smb2 header is used in smb2_allocate_rsp_buf(). This patch add simple buffer size validation to avoid potencial out-of-bounds in request buffer.

Cc: stable@vger.kernel.org Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Conflicts: fs/smb/server/smb2pdu.c fs/ksmbd/smb2pdu.c [lc:file path is not same] 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 4df7108a886f..7937f860ea8f 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -539,6 +539,10 @@ int smb2_allocate_rsp_buf(struct ksmbd_work *work) if (cmd == SMB2_QUERY_INFO_HE) { struct smb2_query_info_req *req;

+ if (get_rfc1002_len(work->request_buf) < + offsetof(struct smb2_query_info_req, OutputBufferLength)) + return -EINVAL; + req = smb2_get_msg(work->request_buf); if ((req->InfoType == SMB2_O_INFO_FILE && (req->FileInfoClass == FILE_FULL_EA_INFORMATION ||