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arm64: stacktrace: Check kretprobe_find_ret_addr() return value

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If kretprobe_find_ret_addr() fails to find the original return address,
it returns 0. Check for this case so that a reliable stacktrace won't
silently ignore it.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Andrea della Porta <andrea.porta@suse.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Song Liu <song@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-and-tested-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20250521111000.2237470-2-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland 2025-05-21 12:09:59 +01:00 committed by Catalin Marinas
parent 91b89a6344
commit beecfd6a88
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kernel/stacktrace.c
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@ -152,6 +152,8 @@ kunwind_recover_return_address(struct kunwind_state *state)
orig_pc = kretprobe_find_ret_addr(state->task,
(void *)state->common.fp,
&state->kr_cur);
if (!orig_pc)
return -EINVAL;
state->common.pc = orig_pc;
state->flags.kretprobe = 1;
}