[dpdk-dev] [dpdk-stable] [PATCH] eal: fix dereference before null check
Ferruh Yigit
ferruh.yigit at intel.com
Wed Oct 14 19:02:49 CEST 2020
On 9/19/2020 11:34 AM, wangyunjian wrote:
> From: Yunjian Wang <wangyunjian at huawei.com>
>
> This patch fixes (dereference after null check) coverity issue.
> The intr_handle may be a null pointer which led to this issue.
>
> Coverity issue: 357695, 357751
> Fixes: 05c4105738d8 ("trace: add interrupt tracepoints")
> Cc: stable at dpdk.org
>
> Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
> ---
> lib/librte_eal/freebsd/eal_interrupts.c | 6 ++++--
> lib/librte_eal/linux/eal_interrupts.c | 6 ++++--
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/lib/librte_eal/freebsd/eal_interrupts.c b/lib/librte_eal/freebsd/eal_interrupts.c
> index 6d53d33c8..028ab457a 100644
> --- a/lib/librte_eal/freebsd/eal_interrupts.c
> +++ b/lib/librte_eal/freebsd/eal_interrupts.c
> @@ -380,7 +380,8 @@ rte_intr_enable(const struct rte_intr_handle *intr_handle)
> }
>
> out:
> - rte_eal_trace_intr_enable(intr_handle, rc);
> + if (intr_handle)
> + rte_eal_trace_intr_enable(intr_handle, rc);
> return rc;
> }
>
> @@ -418,7 +419,8 @@ rte_intr_disable(const struct rte_intr_handle *intr_handle)
> break;
> }
> out:
> - rte_eal_trace_intr_disable(intr_handle, rc);
> + if (intr_handle)
> + rte_eal_trace_intr_disable(intr_handle, rc);
> return rc;
> }
>
> diff --git a/lib/librte_eal/linux/eal_interrupts.c b/lib/librte_eal/linux/eal_interrupts.c
> index 13db5c4e8..e46443873 100644
> --- a/lib/librte_eal/linux/eal_interrupts.c
> +++ b/lib/librte_eal/linux/eal_interrupts.c
> @@ -725,7 +725,8 @@ rte_intr_enable(const struct rte_intr_handle *intr_handle)
> break;
> }
> out:
> - rte_eal_trace_intr_enable(intr_handle, rc);
> + if (intr_handle)
> + rte_eal_trace_intr_enable(intr_handle, rc);
> return rc;
It looks like whole function requires 'intr_handle' to be not NULL, so what do
you think add following at the very beginning of the function and remove other
'intr_handle' NULL checks from function:
if (intr_handle == NULL)
return -1;
> }
>
> @@ -852,7 +853,8 @@ rte_intr_disable(const struct rte_intr_handle *intr_handle)
> break;
> }
> out:
> - rte_eal_trace_intr_disable(intr_handle, rc);
> + if (intr_handle)
> + rte_eal_trace_intr_disable(intr_handle, rc);
> return rc;
> }
>
>
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