The story is that Smatch marks skb->data as untrusted so it generates
a warning message here:
drivers/infiniband/hw/cxgb4/cm.c:4100 process_work()
error: buffer overflow 'work_handlers' 241 <= 255
In other places which handle this such as t4_uld_rx_handler() there is
some checking to make sure that the function pointer is not NULL. I
have added bounds checking and a check for NULL here as well.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 21db3b48a617..844c9e78df8b 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -4097,9 +4097,15 @@ static void process_work(struct work_struct *work)
dev = *((struct c4iw_dev **) (skb->cb + sizeof(void *)));
opcode = rpl->ot.opcode;
- ret = work_handlers[opcode](dev, skb);
- if (!ret)
+ if (opcode >= ARRAY_SIZE(work_handlers) ||
+ !work_handlers[opcode]) {
+ pr_err("No handler for opcode 0x%x.\n", opcode);
kfree_skb(skb);
+ } else {
+ ret = work_handlers[opcode](dev, skb);
+ if (!ret)
+ kfree_skb(skb);
+ }
process_timedout_eps();
}
}
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