| Message ID | 20171006213333.6721-4-bart.vanassche@wdc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
> According to the C standard the behavior of computations with integer > operands is as follows: > * A computation involving unsigned operands can never overflow, > because a result that cannot be represented by the resulting > unsigned integer type is reduced modulo the number that is one > greater than the largest value that can be represented by the > resulting type. > * The behavior for signed integer underflow and overflow is > undefined. > > Hence only use unsigned integers when checking for integer overflow. > > This patch is what I came up with after having analyzed the following > smatch warnings: > > drivers/infiniband/core/cma.c:3448: cma_resolve_ib_udp() warn: signed > overflow undefined. 'offset + conn_param->private_data_len < > conn_param->private_data_len' > drivers/infiniband/core/cma.c:3505: cma_connect_ib() warn: signed > overflow undefined. 'offset + conn_param->private_data_len < > conn_param->private_data_len' > > Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Acked-by: Sean Hefty <sean.hefty@intel.com> -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 852c8fec8088..fa79c7076ccd 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -1540,7 +1540,7 @@ static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id, return id_priv; } -static inline int cma_user_data_offset(struct rdma_id_private *id_priv) +static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv) { return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr); } @@ -1942,7 +1942,8 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) struct rdma_id_private *listen_id, *conn_id = NULL; struct rdma_cm_event event; struct net_device *net_dev; - int offset, ret; + u8 offset; + int ret; listen_id = cma_id_from_event(cm_id, ib_event, &net_dev); if (IS_ERR(listen_id)) @@ -3440,7 +3441,8 @@ static int cma_resolve_ib_udp(struct rdma_id_private *id_priv, struct ib_cm_sidr_req_param req; struct ib_cm_id *id; void *private_data; - int offset, ret; + u8 offset; + int ret; memset(&req, 0, sizeof req); offset = cma_user_data_offset(id_priv); @@ -3497,7 +3499,8 @@ static int cma_connect_ib(struct rdma_id_private *id_priv, struct rdma_route *route; void *private_data; struct ib_cm_id *id; - int offset, ret; + u8 offset; + int ret; memset(&req, 0, sizeof req); offset = cma_user_data_offset(id_priv);
According to the C standard the behavior of computations with integer operands is as follows: * A computation involving unsigned operands can never overflow, because a result that cannot be represented by the resulting unsigned integer type is reduced modulo the number that is one greater than the largest value that can be represented by the resulting type. * The behavior for signed integer underflow and overflow is undefined. Hence only use unsigned integers when checking for integer overflow. This patch is what I came up with after having analyzed the following smatch warnings: drivers/infiniband/core/cma.c:3448: cma_resolve_ib_udp() warn: signed overflow undefined. 'offset + conn_param->private_data_len < conn_param->private_data_len' drivers/infiniband/core/cma.c:3505: cma_connect_ib() warn: signed overflow undefined. 'offset + conn_param->private_data_len < conn_param->private_data_len' Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Sean Hefty <sean.hefty@intel.com> --- drivers/infiniband/core/cma.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)