diff options
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/send.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/rds/send.c b/net/rds/send.c index 38567f3ee7e8..69ab1040d02d 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -846,6 +846,7 @@ static int rds_rm_size(struct msghdr *msg, int data_len) { struct cmsghdr *cmsg; int size = 0; + int cmsg_groups = 0; int retval; for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { @@ -857,19 +858,23 @@ static int rds_rm_size(struct msghdr *msg, int data_len) switch (cmsg->cmsg_type) { case RDS_CMSG_RDMA_ARGS: + cmsg_groups |= 1; retval = rds_rdma_extra_size(CMSG_DATA(cmsg)); if (retval < 0) return retval; size += retval; + break; case RDS_CMSG_RDMA_DEST: case RDS_CMSG_RDMA_MAP: + cmsg_groups |= 2; /* these are valid but do no add any size */ break; case RDS_CMSG_ATOMIC_CSWP: case RDS_CMSG_ATOMIC_FADD: + cmsg_groups |= 1; size += sizeof(struct scatterlist); break; @@ -881,6 +886,10 @@ static int rds_rm_size(struct msghdr *msg, int data_len) size += ceil(data_len, PAGE_SIZE) * sizeof(struct scatterlist); + /* Ensure (DEST, MAP) are never used with (ARGS, ATOMIC) */ + if (cmsg_groups == 3) + return -EINVAL; + return size; } |