Hello,
Our static analysis tool finds a possible null-pointer dereference in
the mwifiex driver in Linux 5.14.0-rc3:
The variable cmd_node->cmd_skb->data is assigned to the variable
host_cmd, and host_cmd is checked in:
190: if (host_cmd == NULL || host_cmd->size == 0)
This indicates that host_cmd can be NULL.
If so, the function mwifiex_recycle_cmd_node() will be called with the
argument cmd_node:
196: mwifiex_recycle_cmd_node(adapter, cmd_node);
In this called function, the variable cmd_node->cmd_skb->data is
assigned to the variable host_cmd, too.
Thus the variable host_cmd in the function mwifiex_recycle_cmd_node()
can be also NULL.
However, it is dereferenced when calling le16_to_cpu():
144: le16_to_cpu(host_cmd->command)
I am not quite sure whether this possible null-pointer dereference is
real and how to fix it if it is real.
Any feedback would be appreciated, thanks!
Reported-by: TOTE Robot <oslab@xxxxxxxxxxxxxxx>
Best wishes,
Tuo Li
