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power: sequencing: fix an invalid pointer dereference in error path

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We may end up calling pwrseq_target_free() on a partially initialized
target object whose unit is either NULL or an ERR_PTR(). Avoid
dereferencing invalid memory by adding an appropriate check to
pwrseq_target_free().

Fixes: 249ebf3f65 ("power: sequencing: implement the pwrseq core")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-pm/62a3531e-9927-40f8-b587-254a2dfa47ef@stanley.mountain/
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20240712194004.241939-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2024-07-12 21:40:04 +02:00
parent e763c9ec71
commit a19ce320c3
1 changed files with 2 additions and 1 deletions
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3
drivers/power/sequencing/core.c
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@ -212,7 +212,8 @@ pwrseq_target_new(const struct pwrseq_target_data *data)
static void pwrseq_target_free(struct pwrseq_target *target)
{
pwrseq_unit_put(target->unit);
if (!IS_ERR_OR_NULL(target->unit))
pwrseq_unit_put(target->unit);
kfree_const(target->name);
kfree(target);
}