This is a note to let you know that I've just added the patch titled
tracing/histograms: Return an error if we fail to add histogram to hist_vars list
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-histograms-return-an-error-if-we-fail-to-add-histogram-to-hist_vars-list.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4b8b3905165ef98386a3c06f196c85d21292d029 Mon Sep 17 00:00:00 2001
From: Mohamed Khalfella <mkhalfella@xxxxxxxxxxxxxxx>
Date: Fri, 14 Jul 2023 20:33:41 +0000
Subject: tracing/histograms: Return an error if we fail to add histogram to hist_vars list
From: Mohamed Khalfella <mkhalfella@xxxxxxxxxxxxxxx>
commit 4b8b3905165ef98386a3c06f196c85d21292d029 upstream.
Commit 6018b585e8c6 ("tracing/histograms: Add histograms to hist_vars if
they have referenced variables") added a check to fail histogram creation
if save_hist_vars() failed to add histogram to hist_vars list. But the
commit failed to set ret to failed return code before jumping to
unregister histogram, fix it.
Link: https://lore.kernel.org/linux-trace-kernel/20230714203341.51396-1-mkhalfella@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6018b585e8c6 ("tracing/histograms: Add histograms to hist_vars if they have referenced variables")
Signed-off-by: Mohamed Khalfella <mkhalfella@xxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_events_hist.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -5792,7 +5792,8 @@ static int event_hist_trigger_func(struc
goto out_unreg;
if (has_hist_vars(hist_data) || hist_data->n_var_refs) {
- if (save_hist_vars(hist_data))
+ ret = save_hist_vars(hist_data);
+ if (ret)
goto out_unreg;
}
Patches currently in stable-queue which might be from mkhalfella@xxxxxxxxxxxxxxx are
queue-4.19/tracing-histograms-return-an-error-if-we-fail-to-add-histogram-to-hist_vars-list.patch
queue-4.19/tracing-histograms-add-histograms-to-hist_vars-if-they-have-referenced-variables.patch
