[PATCH] net/netvsc: fix event buffer leak on realloc failure

[Stephen Hemminger]

On Sun, 25 Oct 2026 02:18:02 +0000
Chen Zhao <ch3nzhao at gmail.com> wrote:

> Hi,
> 
> The AI review reports a double-free and a dangling event_buf:
> https://mails.dpdk.org/archives/test-report/2026-October/1069492.html
> 
> Both findings are false positives:
> 
> 1. On successful reallocation, goto retry skips rte_free(old_buf).
>    The retry label is outside the ENOBUFS block. Each subsequent entry
>    into that block reinitializes old_buf from the current event_buf,
>    so a later allocation failure frees the current allocation, not an
>    address retained from a previous successful reallocation.
> 
> 2. On failure, rte_realloc() returns NULL without freeing the old buffer.
>    That NULL return value has already been assigned to rxq->event_buf
>    before rte_free(old_buf) is reached. Thus event_buf is already NULL;
>    no additional NULL assignment is needed.
> 
> The patch preserves the existing reset-and-retry behavior while freeing
> the old allocation on failure.
> 
> Thanks,
> Chen

The CI AI model is still using to weak a model and I never believe anything it says