Re: [PATCH v2 v2] wifi: wilc1000: fix dma_buffer leak on bus acquire failure

[Simon Horman <horms@kernel.org>]

On Mon, May 11, 2026 at 09:57:32AM +0530, Shitalkumar Gandhi wrote:
> wilc_wlan_firmware_download() allocates dma_buffer with kmalloc() at
> the top of the function and uses a 'fail:' label to free it via
> kfree(dma_buffer) on error.
> 
> All later error paths correctly use 'goto fail' to route through this
> cleanup. However, the early failure path after the first acquire_bus()
> call uses a bare 'return ret;', which leaks dma_buffer whenever the bus
> acquire fails.
> 
> Replace the early return with goto fail so the existing cleanup path
> runs.
> 
> Found via a custom Coccinelle semantic patch hunting for kmalloc'd
> locals leaked on early-return error paths in driver firmware-download
> code.
> 
> Fixes: 1241c5650ff7 ("wifi: wilc1000: Fill in missing error handling")
> Signed-off-by: Shitalkumar Gandhi <shitalkumar.gandhi@cambiumnetworks.com>
> ---
> Changes since v1:
>   - Corrected From: and Signed-off-by: to author's real identity
>     (Shitalkumar Gandhi <shitalkumar.gandhi@cambiumnetworks.com>).
>     v1 was sent with incorrect author attribution due to a local
>     git config mistake. No code changes.

Reviewed-by: Simon Horman <horms@kernel.org>