[PATCH v6 06/14] LoongArch: kexec_file: Fix CMA page leaks in segment placement retry loops

[sashiko-bot at kernel.org]

> During kexec image placement retry loops, any midway failure causes
> the loader to truncate `image->nr_segments` back to its initial state
> to purge the failed segments.
> 
> However, this truncation introduces a memory leak. The CMA pages
> allocated via kexec_add_buffer() during the failed attempt are tracked
> in the `image->segment_cma` array. Because the subsequent cleanup paths
> only iterate up to the truncated `nr_segments` boundary, these allocated
> CMA pages outside the new boundary are permanently leaked.
> 
> Fix this by explicitly releasing the associated CMA buffers in
> the failure paths before `image->nr_segments` is reduced.
> 
> Cc: Huacai Chen <chenhuacai at kernel.org>
> Cc: WANG Xuerui <kernel at xen0n.name>
> Cc: Youling Tang <tangyouling at kylinos.cn>
> Cc: "Mike Rapoport (Microsoft)" <rppt at kernel.org>
> Cc: Sourabh Jain <sourabhjain at linux.ibm.com>
> Cc: Kees Cook <kees at kernel.org>
> Cc: stable at vger.kernel.org
> Link: https://sashiko.dev/#/patchset/20260729031235.2840255-1-ruanjinjie%40huawei.com
> Fixes: 55d990f0084c ("LoongArch: Add EFI binary support for kexec_file")
> Signed-off-by: Jinjie Ruan <ruanjinjie at huawei.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260921090450.807575-1-ruanjinjie@huawei.com?part=6