usb: gadget: rndis: check size of RNDIS_MSG_SET command

mainline inclusion
from mainline-v5.17-rc2
commit 38ea1eac
bugzilla: 186289, https://gitee.com/src-openeuler/kernel/issues/I4VNWC
CVE: CVE-2022-25375
backport: openEuler-22.03-LTS

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=38ea1eac7d88072bbffb630e2b3db83ca649b826

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

Check the size of the RNDIS_MSG_SET command given to us before
attempting to respond to an invalid message size.
Reported-by: NSzymon Heidrich <szymon.heidrich@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NLijun Fang <fanglijun3@huawei.com>
Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/usb/gadget/function/rndis.c

@@ -655,14 +655,17 @@ static int rndis_set_response(struct rndis_params *params,
 	rndis_set_cmplt_type *resp;
 	rndis_resp_t *r;
 
+	BufLength = le32_to_cpu(buf->InformationBufferLength);
+	BufOffset = le32_to_cpu(buf->InformationBufferOffset);
+	if ((BufLength > RNDIS_MAX_TOTAL_SIZE) ||
+	    (BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE))
+		    return -EINVAL;
+
 	r = rndis_add_response(params, sizeof(rndis_set_cmplt_type));
 	if (!r)
 		return -ENOMEM;
 	resp = (rndis_set_cmplt_type *)r->buf;
 
-	BufLength = le32_to_cpu(buf->InformationBufferLength);
-	BufOffset = le32_to_cpu(buf->InformationBufferOffset);
-
 #ifdef	VERBOSE_DEBUG
 	pr_debug("%s: Length: %d\n", __func__, BufLength);
 	pr_debug("%s: Offset: %d\n", __func__, BufOffset);