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authorNick Desaulniers <[email protected]>2020-06-08 13:38:17 -0700
committerWill Deacon <[email protected]>2020-06-10 11:41:08 +0100
commita194c33f45f83068ef13bf1d16e26d4ca3ecc098 (patch)
tree0121634709330fb49f3377a8c18bce97c84b2e80 /scripts/gdb/linux/modules.py
parent625412c210fb6423e40cb22de7d14fc3bb9d9e79 (diff)
arm64: acpi: fix UBSAN warning
Will reported a UBSAN warning: UBSAN: null-ptr-deref in arch/arm64/kernel/smp.c:596:6 member access within null pointer of type 'struct acpi_madt_generic_interrupt' CPU: 0 PID: 0 Comm: swapper Not tainted 5.7.0-rc6-00124-g96bc42ff0a82 #1 Call trace: dump_backtrace+0x0/0x384 show_stack+0x28/0x38 dump_stack+0xec/0x174 handle_null_ptr_deref+0x134/0x174 __ubsan_handle_type_mismatch_v1+0x84/0xa4 acpi_parse_gic_cpu_interface+0x60/0xe8 acpi_parse_entries_array+0x288/0x498 acpi_table_parse_entries_array+0x178/0x1b4 acpi_table_parse_madt+0xa4/0x110 acpi_parse_and_init_cpus+0x38/0x100 smp_init_cpus+0x74/0x258 setup_arch+0x350/0x3ec start_kernel+0x98/0x6f4 This is from the use of the ACPI_OFFSET in arch/arm64/include/asm/acpi.h. Replace its use with offsetof from include/linux/stddef.h which should implement the same logic using __builtin_offsetof, so that UBSAN wont warn. Reported-by: Will Deacon <[email protected]> Suggested-by: Ard Biesheuvel <[email protected]> Signed-off-by: Nick Desaulniers <[email protected]> Reviewed-by: Jeremy Linton <[email protected]> Acked-by: Lorenzo Pieralisi <[email protected]> Cc: [email protected] Link: https://lore.kernel.org/lkml/20200521100952.GA5360@willie-the-truck/ Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
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