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As a > result, the use of free devargs results in a core dump. > > This patch fixes the issue by using valid devargs. > > Fixes: f3a1188cee4a ("devargs: make device representation generic") > Cc: stable@dpdk.org > > Signed-off-by: Mingjin Ye I am not too familiar with how devargs works, so I have a trivial question. I understand the point of this patch, and it is roughly as follows: 1) we enter insert_vdev and allocated new devargs structure (and copy the `name` into devargs) 2) we set dev->device.name to devargs->name 3) we insert devargs into the list using rte_devargs_insert 4) if devargs list already had devargs with the same name, our devargs is destroyed and replaced with devargs that is in the list 5) because of this, dev->device.name becomes invalid as that specific devargs has been freed - it points to name from the old devargs We do need to store devargs->name in dev->device.name, and we need to do so after calling rte_devargs_insert to avoid keeping reference to memory that was freed. So, provisionally, Reviewed-by: Anatoly Burakov My question is, under what circumstances would there be duplicate entries in devargs list? I assume there is an answer to that question because rte_devargs_insert() expects this case, so this is just for my understanding - I can't seem to figure out how we would arrive at a situation where we have duplicate devargs. > --- > drivers/bus/vdev/vdev.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/bus/vdev/vdev.c b/drivers/bus/vdev/vdev.c > index 1a6cc7d12d..53fc4a6e21 100644 > --- a/drivers/bus/vdev/vdev.c > +++ b/drivers/bus/vdev/vdev.c > @@ -286,7 +286,6 @@ insert_vdev(const char *name, const char *args, struct rte_vdev_device **p_dev) > > dev->device.bus = &rte_vdev_bus; > dev->device.numa_node = SOCKET_ID_ANY; > - dev->device.name = devargs->name; > > if (find_vdev(name)) { > /* > @@ -300,6 +299,7 @@ insert_vdev(const char *name, const char *args, struct rte_vdev_device **p_dev) > > rte_devargs_insert(&devargs); > dev->device.devargs = devargs; > + dev->device.name = devargs->name; > TAILQ_INSERT_TAIL(&vdev_device_list, dev, next); > > if (p_dev) -- Thanks, Anatoly