bpf: fix sg shift repair start offset in bpf_msg_pull_data

When we perform the sg shift repair for the scatterlist ring, we
currently start out at i = first_sg + 1. However, this is not
correct since the first_sg could point to the sge sitting at slot
MAX_SKB_FRAGS - 1, and a subsequent i = MAX_SKB_FRAGS will access
the scatterlist ring (sg) out of bounds. Add the sk_msg_iter_var()
helper for iterating through the ring, and apply the same rule
for advancing to the next ring element as we do elsewhere. Later
work will use this helper also in other places.

Fixes: 015632bb30da ("bpf: sk_msg program helper bpf_sk_msg_pull_data")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

net/core/filter.c

@@ -2282,6 +2282,13 @@ static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
 	.arg2_type      = ARG_ANYTHING,
 };
 
+#define sk_msg_iter_var(var)			\
+	do {					\
+		var++;				\
+		if (var == MAX_SKB_FRAGS)	\
+			var = 0;		\
+	} while (0)
+
 BPF_CALL_4(bpf_msg_pull_data,
 	   struct sk_msg_buff *, msg, u32, start, u32, end, u64, flags)
 {
@@ -2302,9 +2309,7 @@ BPF_CALL_4(bpf_msg_pull_data,
 		if (start < offset + len)
 			break;
 		offset += len;
-		i++;
-		if (i == MAX_SKB_FRAGS)
-			i = 0;
+		sk_msg_iter_var(i);
 	} while (i != msg->sg_end);
 
 	if (unlikely(start >= offset + len))
@@ -2330,9 +2335,7 @@ BPF_CALL_4(bpf_msg_pull_data,
 	 */
 	do {
 		copy += sg[i].length;
-		i++;
-		if (i == MAX_SKB_FRAGS)
-			i = 0;
+		sk_msg_iter_var(i);
 		if (bytes_sg_total <= copy)
 			break;
 	} while (i != msg->sg_end);
@@ -2358,9 +2361,7 @@ BPF_CALL_4(bpf_msg_pull_data,
 		sg[i].length = 0;
 		put_page(sg_page(&sg[i]));
 
-		i++;
-		if (i == MAX_SKB_FRAGS)
-			i = 0;
+		sk_msg_iter_var(i);
 	} while (i != last_sg);
 
 	sg[first_sg].length = copy;
@@ -2377,7 +2378,8 @@ BPF_CALL_4(bpf_msg_pull_data,
 	if (!shift)
 		goto out;
 
-	i = first_sg + 1;
+	i = first_sg;
+	sk_msg_iter_var(i);
 	do {
 		int move_from;
 
@@ -2394,9 +2396,7 @@ BPF_CALL_4(bpf_msg_pull_data,
 		sg[move_from].page_link = 0;
 		sg[move_from].offset = 0;
 
-		i++;
-		if (i == MAX_SKB_FRAGS)
-			i = 0;
+		sk_msg_iter_var(i);
 	} while (1);
 	msg->sg_end -= shift;
 	if (msg->sg_end < 0)