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CVE-2023-23559: rndis_wlan: Prevent buffer overflow in rndis_query_oid
In rndis_query_oid in drivers/net/wireless/rndis_wlan.c in the Linux kernel through 6.1.5, there is an integer overflow in an addition.
@@ -697,7 +697,7 @@ static int rndis_query_oid(struct usbnet *dev, u32 oid, void *data, int *len) struct rndis_query_c *get_c; } u; int ret, buflen; - int resplen, respoffs, copylen;
u32 resplen, respoffs, copylen;
buflen = *len + sizeof(*u.get); if (buflen < CONTROL_BUFFER_SIZE) @@ -740,7 +740,7 @@ static int rndis_query_oid(struct usbnet *dev, u32 oid, void *data, int *len) goto exit_unlock; }
- if ((resplen + respoffs) > buflen) {
if (resplen > (buflen - respoffs)) { /\* Device would have returned more data if buffer would \* have been big enough. Copy just the bits that we got. \*/
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