app/testpmd: fix potential out of bounds read

After the last enabled port has been seen, and the last time we
evaluate the loop condition, there is an out of bounds read in
ports[p].enabled because p is equal to size, which is the length of
ports.

Signed-off-by: Julien Cretin <julien.cretin@trust-in-soft.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 4828354..3057791 100644 (file)
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -332,7 +332,7 @@ find_next_port(portid_t p, struct rte_port *ports, int size)
        if (ports == NULL)
                rte_exit(-EINVAL, "failed to find a next port id\n");
 
-       while ((ports[p].enabled == 0) && (p < size))
+       while ((p < size) && (ports[p].enabled == 0))
                p++;
        return p;
 }