Patch "powerpc/imc-pmu: Add a null pointer check in update_events_in_group()" has been added to the 5.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    powerpc/imc-pmu: Add a null pointer check in update_events_in_group()

to the 5.4-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:
     powerpc-imc-pmu-add-a-null-pointer-check-in-update_e.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3af44eabfcb65b52ab9373373432c59612dd7c0d
Author: Kunwu Chan <chentao@xxxxxxxxxx>
Date:   Sun Nov 26 17:37:19 2023 +0800

    powerpc/imc-pmu: Add a null pointer check in update_events_in_group()
    
    [ Upstream commit 0a233867a39078ebb0f575e2948593bbff5826b3 ]
    
    kasprintf() returns a pointer to dynamically allocated memory
    which can be NULL upon failure.
    
    Fixes: 885dcd709ba9 ("powerpc/perf: Add nest IMC PMU support")
    Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
    Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
    Link: https://msgid.link/20231126093719.1440305-1-chentao@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 872313021eaa..565dc073ceca 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -292,6 +292,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
 	attr_group->attrs = attrs;
 	do {
 		ev_val_str = kasprintf(GFP_KERNEL, "event=0x%x", pmu->events[i].value);
+		if (!ev_val_str)
+			continue;
 		dev_str = device_str_attr_create(pmu->events[i].name, ev_val_str);
 		if (!dev_str)
 			continue;
@@ -299,6 +301,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
 		attrs[j++] = dev_str;
 		if (pmu->events[i].scale) {
 			ev_scale_str = kasprintf(GFP_KERNEL, "%s.scale", pmu->events[i].name);
+			if (!ev_scale_str)
+				continue;
 			dev_str = device_str_attr_create(ev_scale_str, pmu->events[i].scale);
 			if (!dev_str)
 				continue;
@@ -308,6 +312,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
 
 		if (pmu->events[i].unit) {
 			ev_unit_str = kasprintf(GFP_KERNEL, "%s.unit", pmu->events[i].name);
+			if (!ev_unit_str)
+				continue;
 			dev_str = device_str_attr_create(ev_unit_str, pmu->events[i].unit);
 			if (!dev_str)
 				continue;