ppp: fix out-of-bounds access in bpf_prog_create()

sock_fprog_kern::len is in units of struct sock_filter, not bytes.

Fixes: 3e859ad ("compat_ioctl: unify copy-in of ppp filters")
Reported-by: [email protected]
Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: ebiggers

drivers/net/ppp/ppp_generic.c

@@ -564,8 +564,9 @@ static struct bpf_prog *get_filter(struct sock_fprog *uprog)
 		return NULL;
 
 	/* uprog->len is unsigned short, so no overflow here */
-	fprog.len = uprog->len * sizeof(struct sock_filter);
-	fprog.filter = memdup_user(uprog->filter, fprog.len);
+	fprog.len = uprog->len;
+	fprog.filter = memdup_user(uprog->filter,
+				   uprog->len * sizeof(struct sock_filter));
 	if (IS_ERR(fprog.filter))
 		return ERR_CAST(fprog.filter);