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Fix this using size_add() which will ensure that the invalid allocations do not succeed. In the callers, move the two constant values "sizeof(struct ksmbd_rpc_command) + 1" onto the same side and use size_add() for the user controlled values. Fixes: 0626e6641f6b ("cifsd: add server handler for central processing and = tranport layers") Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter --- I sent this patch in Oct 2023 but it wasn't applied. https://lore.kernel.org/all/205c4ec1-7c41-4f5d-8058-501fc1b5163c@moroto.mou= ntain/ I reviewed this code again today and it is still an issue. fs/smb/server/transport_ipc.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/fs/smb/server/transport_ipc.c b/fs/smb/server/transport_ipc.c index befaf42b84cc..ec72c97b2f0b 100644 --- a/fs/smb/server/transport_ipc.c +++ b/fs/smb/server/transport_ipc.c @@ -242,7 +242,7 @@ static void ipc_update_last_active(void) static struct ksmbd_ipc_msg *ipc_msg_alloc(size_t sz) { struct ksmbd_ipc_msg *msg; - size_t msg_sz =3D sz + sizeof(struct ksmbd_ipc_msg); + size_t msg_sz =3D size_add(sz, sizeof(struct ksmbd_ipc_msg)); =20 msg =3D kvzalloc(msg_sz, KSMBD_DEFAULT_GFP); if (msg) @@ -626,8 +626,8 @@ ksmbd_ipc_spnego_authen_request(const char *spnego_blob= , int blob_len) struct ksmbd_spnego_authen_request *req; struct ksmbd_spnego_authen_response *resp; =20 - msg =3D ipc_msg_alloc(sizeof(struct ksmbd_spnego_authen_request) + - blob_len + 1); + msg =3D ipc_msg_alloc(size_add(sizeof(struct ksmbd_spnego_authen_request)= + 1, + blob_len)); if (!msg) return NULL; =20 @@ -805,7 +805,8 @@ struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_= session *sess, int handle struct ksmbd_rpc_command *req; struct ksmbd_rpc_command *resp; =20 - msg =3D ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1); + msg =3D ipc_msg_alloc(size_add(sizeof(struct ksmbd_rpc_command) + 1, + payload_sz)); if (!msg) return NULL; =20 @@ -853,7 +854,7 @@ struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_= session *sess, int handle struct ksmbd_rpc_command *req; struct ksmbd_rpc_command *resp; =20 - msg =3D ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1); + msg =3D ipc_msg_alloc(size_add(sizeof(struct ksmbd_rpc_command) + 1, payl= oad_sz)); if (!msg) return NULL; =20 @@ -878,7 +879,7 @@ struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_se= ssion *sess, void *payloa struct ksmbd_rpc_command *req; struct ksmbd_rpc_command *resp; =20 - msg =3D ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1); + msg =3D ipc_msg_alloc(size_add(sizeof(struct ksmbd_rpc_command) + 1, payl= oad_sz)); if (!msg) return NULL; =20 --=20 2.45.2