usb: mtu3: fix memory corruption in mtu3_debugfs_regset()

stable inclusion
from stable-5.10.3
commit 4cfc27cb56208be233915bb524198a5f1da4679a
bugzilla: 46871

--------------------------------

commit 3f6f6343 upstream.

This code is using the wrong sizeof() so it does not allocate enough
memory.  It allocates 32 bytes but 72 are required.  That will lead to
memory corruption.

Fixes: ae078092 ("usb: mtu3: add debugfs interface files")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/X8ikqc4Mo2/0G72j@mwanda
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>

drivers/usb/mtu3/mtu3_debugfs.c

@@ -127,7 +127,7 @@ static void mtu3_debugfs_regset(struct mtu3 *mtu, void __iomem *base,
 	struct debugfs_regset32 *regset;
 	struct mtu3_regset *mregs;
 
-	mregs = devm_kzalloc(mtu->dev, sizeof(*regset), GFP_KERNEL);
+	mregs = devm_kzalloc(mtu->dev, sizeof(*mregs), GFP_KERNEL);
 	if (!mregs)
 		return;