in dns parsing callback, enforce MAXADDRS to preclude overflow

[musl] / src / network / lookup_name.c

diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index 066be4d..209c20f 100644 (file)
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -111,6 +111,7 @@ static int dns_parse_callback(void *c, int rr, const void *data, int len, const
 {
        char tmp[256];
        struct dpc_ctx *ctx = c;
+       if (ctx->cnt >= MAXADDRS) return -1;
        switch (rr) {
        case RR_A:
                if (len != 4) return -1;