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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
This commit is contained in:
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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2
arch/powerpc/kexec/file_load_64.c
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@ -664,7 +664,7 @@ unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *
extra_size += (cpu_nodes - boot_cpu_node_count) * cpu_node_size();
/* Consider extra space for reserved memory ranges if any */
if (rmem->nr_ranges > 0)
if (rmem && rmem->nr_ranges > 0)
extra_size += sizeof(struct fdt_reserve_entry) * rmem->nr_ranges;
return extra_size + kdump_extra_fdt_size_ppc64(image, cpu_nodes);