ipmi:ssif: Handle a possible NULL pointer reference

[ Upstream commit 6b8526d3abc02c08a2f888e8c20b7ac9e5776dfe ]

In error cases a NULL can be passed to memcpy.  The length will always
be zero, so it doesn't really matter, but go ahead and check for NULL,
anyway, to be more precise and avoid static analysis errors.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index 22c6a2e612360aeae7a9d8fadbc2f43790903186..8ac390c2b51475b5dc79559c931dbd0b7f777571 100644 (file)
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -775,10 +775,14 @@ static void msg_done_handler(struct ssif_info *ssif_info, int result,
        flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
        msg = ssif_info->curr_msg;
        if (msg) {
+               if (data) {
+                       if (len > IPMI_MAX_MSG_LENGTH)
+                               len = IPMI_MAX_MSG_LENGTH;
+                       memcpy(msg->rsp, data, len);
+               } else {
+                       len = 0;
+               }
                msg->rsp_size = len;
-               if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
-                       msg->rsp_size = IPMI_MAX_MSG_LENGTH;
-               memcpy(msg->rsp, data, msg->rsp_size);
                ssif_info->curr_msg = NULL;
        }