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tracing: probes: Fix to zero initialize a local variable 

commit 0add699ad068d26e5b1da9ff28b15461fc4005df upstream.

Fix to initialize 'val' local variable with zero.
Dan reported that Smatch static code checker reports an error that a local
'val' variable needs to be initialized. Actually, the 'val' is expected to
be initialized by FETCH_OP_ARG in the same loop, but it is not obvious. So
initialize it with zero.

Link: https://lore.kernel.org/all/171092223833.237219.17304490075697026697.stgit@devnote2/

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/b010488e-68aa-407c-add0-3e059254aaa0@moroto.mountain/
Fixes: 25f00e40ce79 ("tracing/probes: Support $argN in return probe (kprobe and fprobe)")
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu (Google) 2024-03-20 17:10:38 +09:00 committed by Greg Kroah-Hartman
parent 042804a9ff
commit 81507f633e
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_probe.c
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@ -843,7 +843,7 @@ out:
void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs)
{
struct probe_entry_arg *earg = tp->entry_arg;
unsigned long val;
unsigned long val = 0;
int i;
if (!earg)