This is a note to let you know that I've just added the patch titled
tracing: fix double free
to the 5.8-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-fix-double-free.patch
and it can be found in the queue-5.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 46bbe5c671e06f070428b9be142cc4ee5cedebac Mon Sep 17 00:00:00 2001
From: Tom Rix <trix@xxxxxxxxxx>
Date: Mon, 7 Sep 2020 06:58:45 -0700
Subject: tracing: fix double free
From: Tom Rix <trix@xxxxxxxxxx>
commit 46bbe5c671e06f070428b9be142cc4ee5cedebac upstream.
clang static analyzer reports this problem
trace_events_hist.c:3824:3: warning: Attempt to free
released memory
kfree(hist_data->attrs->var_defs.name[i]);
In parse_var_defs() if there is a problem allocating
var_defs.expr, the earlier var_defs.name is freed.
This free is duplicated by free_var_defs() which frees
the rest of the list.
Because free_var_defs() has to run anyway, remove the
second free fom parse_var_defs().
Link: https://lkml.kernel.org/r/20200907135845.15804-1-trix@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 30350d65ac56 ("tracing: Add variable support to hist triggers")
Reviewed-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_events_hist.c | 1 -
1 file changed, 1 deletion(-)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -3865,7 +3865,6 @@ static int parse_var_defs(struct hist_tr
s = kstrdup(field_str, GFP_KERNEL);
if (!s) {
- kfree(hist_data->attrs->var_defs.name[n_vars]);
ret = -ENOMEM;
goto free;
}
Patches currently in stable-queue which might be from trix@xxxxxxxxxx are
queue-5.8/ieee802154-adf7242-check-status-of-adf7242_read_reg.patch
queue-5.8/tracing-fix-double-free.patch
queue-5.8/alsa-asihpi-fix-iounmap-in-error-handler.patch
