* [dpdk-dev] [PATCH] vhost: fix possible null pointer dereferencing
@ 2018-11-27 9:23 Maxime Coquelin
2018-11-27 9:44 ` Tiwei Bie
0 siblings, 1 reply; 3+ messages in thread
From: Maxime Coquelin @ 2018-11-27 9:23 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
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/vhost_user.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 3ea64eba6..c44fef9cc 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -489,6 +489,9 @@ 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))
+ 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-dev] [PATCH] vhost: fix possible null pointer dereferencing
2018-11-27 9:23 [dpdk-dev] [PATCH] vhost: fix possible null pointer dereferencing Maxime Coquelin
@ 2018-11-27 9:44 ` Tiwei Bie
2018-11-27 9:52 ` Maxime Coquelin
0 siblings, 1 reply; 3+ messages in thread
From: Tiwei Bie @ 2018-11-27 9:44 UTC (permalink / raw)
To: Maxime Coquelin; +Cc: dev, zhihong.wang, jfreimann, stable
On Tue, Nov 27, 2018 at 10:23:25AM +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
>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
> lib/librte_vhost/vhost_user.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index 3ea64eba6..c44fef9cc 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -489,6 +489,9 @@ 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))
> + return 0;
Better to also zero *len.
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
> +
> /* 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-dev] [PATCH] vhost: fix possible null pointer dereferencing
2018-11-27 9:44 ` Tiwei Bie
@ 2018-11-27 9:52 ` Maxime Coquelin
0 siblings, 0 replies; 3+ messages in thread
From: Maxime Coquelin @ 2018-11-27 9:52 UTC (permalink / raw)
To: Tiwei Bie; +Cc: dev, zhihong.wang, jfreimann, stable
On 11/27/18 10:44 AM, Tiwei Bie wrote:
> On Tue, Nov 27, 2018 at 10:23:25AM +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
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> ---
>> lib/librte_vhost/vhost_user.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
>> index 3ea64eba6..c44fef9cc 100644
>> --- a/lib/librte_vhost/vhost_user.c
>> +++ b/lib/librte_vhost/vhost_user.c
>> @@ -489,6 +489,9 @@ 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))
>> + return 0;
>
> Better to also zero *len.
>
> Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
Right, I'll post a v2 zeroing *len.
Thanks,
Maxime
>
>> +
>> /* 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
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2018-11-27 9:23 [dpdk-dev] [PATCH] vhost: fix possible null pointer dereferencing Maxime Coquelin
2018-11-27 9:44 ` Tiwei Bie
2018-11-27 9:52 ` Maxime Coquelin
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