net: dns: Fix next answer position when parsing packet

jukkar · nashif · commit 0bc8a0dab2d8 · 2020-12-08T14:42:26.000-05:00
As the answer might not be compressed, calculate next answer
position correctly.

Signed-off-by: Jukka Rissanen &lt;jukka.rissanen@linux.intel.com&gt;
Signed-off-by: Flavio Ceolin &lt;flavio.ceolin@intel.com&gt;
diff --git a/subsys/net/lib/dns/resolve.c b/subsys/net/lib/dns/resolve.c
@@ -463,7 +463,8 @@ static int dns_read(struct dns_resolve_context *ctx,
 		}
 
 		/* Update the answer offset to point to the next RR (answer) */
-		dns_msg.answer_offset += DNS_ANSWER_PTR_LEN;
+		dns_msg.answer_offset += dns_msg.response_position -
+							dns_msg.answer_offset;
 		dns_msg.answer_offset += dns_msg.response_length;
 
 		server_idx++;

Original file line number	Diff line number	Diff line change
`@@ -463,7 +463,8 @@ static int dns_read(struct dns_resolve_context *ctx,`
`463`	`463`	`}`
`464`	`464`
`465`	`465`	`/* Update the answer offset to point to the next RR (answer) */`
`466`		`- dns_msg.answer_offset += DNS_ANSWER_PTR_LEN;`
	`466`	`+ dns_msg.answer_offset += dns_msg.response_position -`
	`467`	`+ dns_msg.answer_offset;`
`467`	`468`	`dns_msg.answer_offset += dns_msg.response_length;`
`468`	`469`
`469`	`470`	`server_idx++;`