bus/fslmc: fix iterating on a class type

This patches fixes a null pointer dereferencing that happens
when the device string passed to the iterator is NULL. This
situation can happen when iterating on a class type.
For example:

RTE_DEV_FOREACH(dev, "class=eth", &dev_iter) {
    ...
}

Fixes: e67a61614d0b ("bus/fslmc: support device iteration")
Cc: stable@dpdk.org
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Adrián Moreno <amorenoz@redhat.com>

diff --git a/drivers/bus/fslmc/fslmc_bus.c b/drivers/bus/fslmc/fslmc_bus.c
index afbd82e..ac46eb4 100644 (file)
--- a/drivers/bus/fslmc/fslmc_bus.c
+++ b/drivers/bus/fslmc/fslmc_bus.c
@@ -603,6 +603,11 @@ fslmc_bus_dev_iterate(const void *start, const char *str,
        struct rte_dpaa2_device *dev;
        char *dup, *dev_name = NULL;
 
+       if (str == NULL) {
+               DPAA2_BUS_DEBUG("No device string");
+               return NULL;
+       }
+
        /* Expectation is that device would be name=device_name */
        if (strncmp(str, "name=", 5) != 0) {
                DPAA2_BUS_DEBUG("Invalid device string (%s)\n", str);