* [dpdk-stable] [PATCH v2] vhost: fix possible null pointer dereferencing
@ 2018-11-27 9:54 Maxime Coquelin
2018-11-27 10:30 ` Jens Freimann
0 siblings, 1 reply; 3+ messages in thread
From: Maxime Coquelin @ 2018-11-27 9:54 UTC (permalink / raw)
To: dev, tiwei.bie, zhihong.wang, jfreimann; +Cc: stable, Maxime Coquelin
If mmap() call fails in vhost_user_set_mem_table, dev->mem
is set to NULL. If later, qva_to_vva() is called, a segfault
occurs.
Fixes: 8f972312b8f4 ("vhost: support vhost-user")
Cc: stable@dpdk.org
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/vhost_user.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 3ea64eba6..9fdd16172 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -489,6 +489,12 @@ qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
struct rte_vhost_mem_region *r;
uint32_t i;
+ if (unlikely(!dev || !dev->mem)) {
+ *len = 0;
+
+ return 0;
+ }
+
/* Find the region where the address lives. */
for (i = 0; i < dev->mem->nregions; i++) {
r = &dev->mem->regions[i];
--
2.17.2
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [dpdk-stable] [PATCH v2] vhost: fix possible null pointer dereferencing
2018-11-27 9:54 [dpdk-stable] [PATCH v2] vhost: fix possible null pointer dereferencing Maxime Coquelin
@ 2018-11-27 10:30 ` Jens Freimann
2018-12-11 18:30 ` Maxime Coquelin
0 siblings, 1 reply; 3+ messages in thread
From: Jens Freimann @ 2018-11-27 10:30 UTC (permalink / raw)
To: Maxime Coquelin; +Cc: dev, tiwei.bie, zhihong.wang, stable
On Tue, Nov 27, 2018 at 10:54:51AM +0100, Maxime Coquelin wrote:
>If mmap() call fails in vhost_user_set_mem_table, dev->mem
>is set to NULL. If later, qva_to_vva() is called, a segfault
>occurs.
>
>Fixes: 8f972312b8f4 ("vhost: support vhost-user")
>Cc: stable@dpdk.org
>
>Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
>Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>---
> lib/librte_vhost/vhost_user.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
Jumping to an out label would have worked as well, but it doesn't
really matter.
Reviewed-by: Jens Freimann <jfreimann@redhat.com>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [dpdk-stable] [PATCH v2] vhost: fix possible null pointer dereferencing
2018-11-27 10:30 ` Jens Freimann
@ 2018-12-11 18:30 ` Maxime Coquelin
0 siblings, 0 replies; 3+ messages in thread
From: Maxime Coquelin @ 2018-12-11 18:30 UTC (permalink / raw)
To: Jens Freimann; +Cc: dev, tiwei.bie, zhihong.wang, stable
On 11/27/18 11:30 AM, Jens Freimann wrote:
> On Tue, Nov 27, 2018 at 10:54:51AM +0100, Maxime Coquelin wrote:
>> If mmap() call fails in vhost_user_set_mem_table, dev->mem
>> is set to NULL. If later, qva_to_vva() is called, a segfault
>> occurs.
>>
>> Fixes: 8f972312b8f4 ("vhost: support vhost-user")
>> Cc: stable@dpdk.org
>>
>> Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> ---
>> lib/librte_vhost/vhost_user.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>
> Jumping to an out label would have worked as well, but it doesn't
> really matter.
>
> Reviewed-by: Jens Freimann <jfreimann@redhat.com>
>
Thanks, applied with label change you suggested.
Maxime
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-11-27 9:54 [dpdk-stable] [PATCH v2] vhost: fix possible null pointer dereferencing Maxime Coquelin
2018-11-27 10:30 ` Jens Freimann
2018-12-11 18:30 ` Maxime Coquelin
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