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arm64: kexec_file: Use struct_size() in kmalloc()

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Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200617213407.GA1385@embeddedor
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2020-06-17 16:34:07 -05:00 committed by Will Deacon
parent 618e07865b
commit bf508ec95c
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/kernel/machine_kexec_file.c
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@ -219,8 +219,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
MEMBLOCK_NONE, &start, &end, NULL)
nr_ranges++;
cmem = kmalloc(sizeof(struct crash_mem) +
sizeof(struct crash_mem_range) * nr_ranges, GFP_KERNEL);
cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL);
if (!cmem)
return -ENOMEM;