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tracing/probes: Fix not to count error code to total length

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commit b41326b5e0 upstream.

Fix not to count the error code (which is minus value) to the total
used length of array, because it can mess up the return code of
process_fetch_insn_bottom(). Also clear the 'ret' value because it
will be used for calculating next data_loc entry.

Link: https://lore.kernel.org/all/168908493827.123124.2175257289106364229.stgit@devnote2/

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/8819b154-2ba1-43c3-98a2-cbde20892023@moroto.mountain/
Fixes: 9b960a3883 ("tracing: probeevent: Unify fetch_insn processing common part")
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu (Google) 2023-07-11 23:15:38 +09:00 • committed by Justin Hammond
parent e4529848d1
commit 9eacbf62dc
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace_probe_tmpl.h
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@ -143,6 +143,8 @@ stage3:
array:
/* the last stage: Loop on array */
if (code->op == FETCH_OP_LP_ARRAY) {
if (ret < 0)
ret = 0;
total += ret;
if (++i < code->param) {
code = s3;