5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
[ Upstream commit 3df463865ba42b8f88a590326f4c9ea17a1ce459 ]
The put_device(&stm->dev) call will trigger stm_device_release() which
frees "stm" so the vfree(stm) on the next line is a double free.
Fixes: 389b6699a2aa ("stm class: Fix stm device initialization order")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240429130119.1518073-2-alexander.shishkin@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/hwtracing/stm/core.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 603b83ac50852..1cfae56c4fdbd 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -878,8 +878,11 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
return -ENOMEM;
stm->major = register_chrdev(0, stm_data->name, &stm_fops);
- if (stm->major < 0)
- goto err_free;
+ if (stm->major < 0) {
+ err = stm->major;
+ vfree(stm);
+ return err;
+ }
device_initialize(&stm->dev);
stm->dev.devt = MKDEV(stm->major, 0);
@@ -923,10 +926,8 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
err_device:
unregister_chrdev(stm->major, stm_data->name);
- /* matches device_initialize() above */
+ /* calls stm_device_release() */
put_device(&stm->dev);
-err_free:
- vfree(stm);
return err;
}
--
2.43.0
