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x86/boot/compressed: Use boot_kstrtoul() for hugepages= parsing

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Replace simple_strtoull() with boot_kstrtoul() for parsing the hugepages= boot
parameter.

Unlike simple_strtoull(), boot_kstrtoul() performs strict validation and
returns an error on invalid inputs instead of silently accepting partial
input. Use boot_kstrtoul() to reject and warn about invalid hugepages= values.

boot_kstrtoul() also converts the input directly to an unsigned long and
avoids implicit casting as max_gb_huge_pages *is* an unsigned long.

  [ bp: Massage commit message. ]

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260409161600.152012-2-thorsten.blum@linux.dev
This commit is contained in:
Thorsten Blum 2026-04-09 18:15:59 +02:00 committed by Borislav Petkov (AMD)
parent 7fd2df204f
commit 7b894dac26
1 changed files with 2 additions and 1 deletions
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3
arch/x86/boot/compressed/kaslr.c
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@ -219,7 +219,8 @@ static void parse_gb_huge_pages(char *param, char *val)
if (!strcmp(param, "hugepages") && gbpage_sz) {
p = val;
max_gb_huge_pages = simple_strtoull(p, &p, 0);
if (boot_kstrtoul(p, 0, &max_gb_huge_pages))
warn("Failed to parse hugepages= boot parameter\n");
return;
}
}