FAILED: patch "[PATCH] tracing/hist: Fix wrong return value in parse_action_params()" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Possible dependencies:

2cc6a528882d ("tracing/hist: Fix wrong return value in parse_action_params()")
d0cd871ba0d6 ("tracing: Have histogram code pass around trace_array for error handling")
d566c5e9d1ba ("tracing: Use tracing error_log with hist triggers")
a1a05bb40e22 ("tracing: Save the last hist command's associated event name")
e91eefd731d9 ("tracing: Add alternative synthetic event trace action syntax")
dff81f559285 ("tracing: Add hist trigger onchange() handler")
a3785b7eca8f ("tracing: Add hist trigger snapshot() action")
466f4528fbc6 ("tracing: Generalize hist trigger onmax and save action")
c3e49506a0f4 ("tracing: Split up onmatch action data")
5032b3818913 ("tracing: Make hist trigger Documentation better reflect actions/handlers")
7d18a10c3167 ("tracing: Refactor hist trigger action code")
036876fa5620 ("tracing: Have the historgram use the result of str_has_prefix() for len of prefix")
754481e6954c ("tracing: Use str_has_prefix() helper for histogram code")
05ddb25cb314 ("tracing: Add hist trigger comments for variable-related fields")
de40f033d4e8 ("tracing: Remove open-coding of hist trigger var_ref management")
2f31ed9308cc ("tracing: Change strlen to sizeof for hist trigger static strings")
6801f0d5ca00 ("tracing: Remove unnecessary hist trigger struct field")
0e2b81f7b52a ("tracing: Remove unneeded synth_event_mutex")
7bbab38d07f3 ("tracing: Use dyn_event framework for synthetic events")
faacb361f271 ("tracing: Simplify creation and deletion of synthetic events")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 2cc6a528882d0e0ccbc1bca5f95b8c963cedac54 Mon Sep 17 00:00:00 2001
From: Zheng Yejian <zhengyejian1@huawei.com>
Date: Wed, 7 Dec 2022 11:46:35 +0800
Subject: [PATCH] tracing/hist: Fix wrong return value in parse_action_params()

When number of synth fields is more than SYNTH_FIELDS_MAX,
parse_action_params() should return -EINVAL.

Link: https://lore.kernel.org/linux-trace-kernel/20221207034635.2253990-1-zhengyejian1@huawei.com

Cc: <mhiramat@kernel.org>
Cc: <zanussi@kernel.org>
Cc: stable@vger.kernel.org
Fixes: c282a386a397 ("tracing: Add 'onmatch' hist trigger action support")
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index a0cd118af527..b4ad86c22b43 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -3609,6 +3609,7 @@ static int parse_action_params(struct trace_array *tr, char *params,
 	while (params) {
 		if (data->n_params >= SYNTH_FIELDS_MAX) {
 			hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
+			ret = -EINVAL;
 			goto out;
 		}