Fix MAX_REG_OFFSET calculation, make it point to the last register in 'struct pt_regs' and not to the marker itself, which could allow regs_get_register() to return an invalid offset.

Cc: stable@vger.kernel.org Fixes: 803b0fc5c3f2baa6e5 ("LoongArch: Add process management") Signed-off-by: Huacai Chen chenhuacai@loongson.cn --- arch/loongarch/include/asm/ptrace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/include/asm/ptrace.h b/arch/loongarch/include/asm/ptrace.h index a5b63c84f854..e5d21e836d99 100644 --- a/arch/loongarch/include/asm/ptrace.h +++ b/arch/loongarch/include/asm/ptrace.h @@ -55,7 +55,7 @@ static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long v

/* Query offset/name of register from its name/offset */ extern int regs_query_register_offset(const char *name); -#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last)) +#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last) - sizeof(unsigned long))

/** * regs_get_register() - get register value from its offset