[PATCH v5 04/17] arm64: 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: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: Breno Leitao <leitao at debian.org>
> Cc: Pratyush Yadav <pratyush at kernel.org>
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Cc: Yeoreum Yun <yeoreum.yun at arm.com>
> Cc: Baoquan He <bhe at redhat.com>
> Cc: stable at vger.kernel.org
> Fixes: 07d24902977e4 ("kexec: enable CMA based contiguous allocation")
> 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/20260918100442.3841135-1-ruanjinjie@huawei.com?part=4