[PATCH 4.9 19/32] staging: rtl8712: uninitialized memory in read_bbreg_hdl()

[Greg Kroah-Hartman]

[ Upstream commit 22c971db7dd4b0ad8dd88e99c407f7a1f4231a2e ]

Colin King reported a bug in read_bbreg_hdl():

        memcpy(pcmd->rsp, (u8 *)&val, pcmd->rspsz);

The problem is that "val" is uninitialized.

This code is obviously not useful, but so far as I can tell
"pcmd->cmdcode" is never GEN_CMD_CODE(_Read_BBREG) so it's not harmful
either.  For now the easiest fix is to just call r8712_free_cmd_obj()
and return.

Fixes: 2865d42c78a9 ("staging: r8712u: Add the new driver to the mainline 
kernel")
Reported-by: Colin Ian King <colin.k...@canonical.com>
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Sasha Levin (Microsoft) <sas...@kernel.org>
---
 drivers/staging/rtl8712/rtl8712_cmd.c | 10 +---------
 drivers/staging/rtl8712/rtl8712_cmd.h |  2 +-
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/rtl8712/rtl8712_cmd.c 
b/drivers/staging/rtl8712/rtl8712_cmd.c
index 9f61583af150..41b667c8385c 100644
--- a/drivers/staging/rtl8712/rtl8712_cmd.c
+++ b/drivers/staging/rtl8712/rtl8712_cmd.c
@@ -158,17 +158,9 @@ static u8 write_macreg_hdl(struct _adapter *padapter, u8 
*pbuf)
 
 static u8 read_bbreg_hdl(struct _adapter *padapter, u8 *pbuf)
 {
-       u32 val;
-       void (*pcmd_callback)(struct _adapter *dev, struct cmd_obj      *pcmd);
        struct cmd_obj *pcmd  = (struct cmd_obj *)pbuf;
 
-       if (pcmd->rsp && pcmd->rspsz > 0)
-               memcpy(pcmd->rsp, (u8 *)&val, pcmd->rspsz);
-       pcmd_callback = cmd_callback[pcmd->cmdcode].callback;
-       if (!pcmd_callback)
-               r8712_free_cmd_obj(pcmd);
-       else
-               pcmd_callback(padapter, pcmd);
+       r8712_free_cmd_obj(pcmd);
        return H2C_SUCCESS;
 }
 
diff --git a/drivers/staging/rtl8712/rtl8712_cmd.h 
b/drivers/staging/rtl8712/rtl8712_cmd.h
index 67e9e910aef9..d10a59d4a550 100644
--- a/drivers/staging/rtl8712/rtl8712_cmd.h
+++ b/drivers/staging/rtl8712/rtl8712_cmd.h
@@ -152,7 +152,7 @@ enum rtl8712_h2c_cmd {
 static struct _cmd_callback    cmd_callback[] = {
        {GEN_CMD_CODE(_Read_MACREG), NULL}, /*0*/
        {GEN_CMD_CODE(_Write_MACREG), NULL},
-       {GEN_CMD_CODE(_Read_BBREG), &r8712_getbbrfreg_cmdrsp_callback},
+       {GEN_CMD_CODE(_Read_BBREG), NULL},
        {GEN_CMD_CODE(_Write_BBREG), NULL},
        {GEN_CMD_CODE(_Read_RFREG), &r8712_getbbrfreg_cmdrsp_callback},
        {GEN_CMD_CODE(_Write_RFREG), NULL}, /*5*/
-- 
2.19.1