powerpc/kexec_file: Fix null-ptr-def in extra size calculation

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A static Sashiko AI review identified a potential NULL pointer
dereference in kexec_extra_fdt_size_ppc64().

On platforms without any reserved memory regions,
get_reserved_memory_ranges() can return 0 while leaving 'rmem'
unallocated as NULL. Passing it directly leads to a kernel panic when
evaluating 'rmem->nr_ranges'.

Add a NULL check for 'rmem' to prevent this crash.

Cc: stable@vger.kernel.org
Fixes: 0d3ff06733 ("powerpc/kexec_file: fix extra size calculation for kexec FDT")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260729012948.2797865-3-ruanjinjie@huawei.com

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Jinjie Ruan 2026-07-29 09:29:47 +08:00 • committed by Madhavan Srinivasan

parent 4cc4b58600

commit 761eda315a

1 changed files with 1 additions and 1 deletions

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arch/powerpc/kexec/file_load_64.c

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