RDS: Add a warning if trying to allocate 0 sgs

rds_message_alloc_sgs() only works when nents is nonzero.

Signed-off-by: Andy Grover <andy.grover@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/rds/message.c b/net/rds/message.c
index f4c3be0878e9..1f73a7358a8e 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -240,6 +240,7 @@ struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
         struct scatterlist *sg_ret;
 
         WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
+        WARN_ON(!nents);
 
         sg_ret = &sg_first[rm->m_used_sgs];
         sg_init_table(sg_ret, nents);