drivers/net/ppp: use standard array-copy-function

In ppp_generic.c, memdup_user() is utilized to copy a userspace array.
This is done without an overflow-check, which is, however, not critical
because the multiplicands are an unsigned short and struct sock_filter,
which is currently of size 8.

Regardless, string.h now provides memdup_array_user(), a wrapper for
copying userspace arrays in a standardized manner, which has the
advantage of making it more obvious to the reader that an array is being
copied.
The wrapper additionally performs an obligatory overflow check, saving
the reader the effort of analyzing the potential for overflow, and
making the code a bit more robust in case of future changes to the
multiplicands len * size.

Replace memdup_user() with memdup_array_user().

Suggested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Philipp Stanner

drivers/net/ppp/ppp_generic.c

@@ -570,8 +570,8 @@ static struct bpf_prog *get_filter(struct sock_fprog *uprog)
 
 	/* uprog->len is unsigned short, so no overflow here */
 	fprog.len = uprog->len;
-	fprog.filter = memdup_user(uprog->filter,
-				   uprog->len * sizeof(struct sock_filter));
+	fprog.filter = memdup_array_user(uprog->filter,
+					 uprog->len, sizeof(struct sock_filter));
 	if (IS_ERR(fprog.filter))
 		return ERR_CAST(fprog.filter);