From: Steven Rostedt rostedt@goodmis.org

The code has integrity checks to make sure that depth never goes below zero. But the depth field has recently been converted to unsigned long from "int" (for alignment reasons). As unsigned long can never be less than zero, the integrity checks no longer work.

Convert depth to long from unsigned long to allow the integrity checks to work again.

Cc: stable@vger.kernel.org Cc: Mathieu Desnoyers mathieu.desnoyers@efficios.com Cc: pengdonglin pengdonglin@xiaomi.com Link: https://patch.msgid.link/20260102143148.251c2e16@gandalf.local.home Reported-by: Dan Carpenter dan.carpenter@linaro.org Closes: https://lore.kernel.org/all/aS6kGi0maWBl-MjZ@stanley.mountain/ Fixes: f83ac7544fbf7 ("function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously") Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Acked-by: Masami Hiramatsu (Google) mhiramat@kernel.org --- include/linux/ftrace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 770f0dc993cc..a3a8989e3268 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -1167,7 +1167,7 @@ static inline void ftrace_init(void) { } */ struct ftrace_graph_ent { unsigned long func; /* Current function */ - unsigned long depth; + long depth; /* signed to check for less than zero */ } __packed;

/*