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LoongArch: Fix MAX_REG_OFFSET calculation

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commit 90436d234230e9a950ccd87831108b688b27a234 upstream.

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: 803b0fc5c3 ("LoongArch: Add process management")
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huacai Chen
2025-05-14 22:17:43 +08:00
committed by Greg Kroah-Hartman
parent e89bd983f3
commit ad1e441016
1 changed files with 1 additions and 1 deletions
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2
arch/loongarch/include/asm/ptrace.h
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@@ -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