Messages in this thread Patch in this message | | | From | Manivannan Sadhasivam <> | Subject | [PATCH 1/2] OPP: Fix potential null ptr dereference in dev_pm_opp_get_required_pstate() | Date | Fri, 21 Jul 2023 18:16:33 +0530 |
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"opp" pointer is dereferenced before the IS_ERR_OR_NULL() check. Fix it by removing the dereference to cache opp_table and dereference it directly where opp_table is used.
This fixes the following smatch warning:
drivers/opp/core.c:232 dev_pm_opp_get_required_pstate() warn: variable dereferenced before IS_ERR check 'opp' (see line 230)
Fixes: 84cb7ff35fcf ("OPP: pstate is only valid for genpd OPP tables") Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- drivers/opp/core.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 3f46e499d615..98633ccd170a 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -227,20 +227,18 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_level); unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp, unsigned int index) { - struct opp_table *opp_table = opp->opp_table; - if (IS_ERR_OR_NULL(opp) || !opp->available || - index >= opp_table->required_opp_count) { + index >= opp->opp_table->required_opp_count) { pr_err("%s: Invalid parameters\n", __func__); return 0; } /* required-opps not fully initialized yet */ - if (lazy_linking_pending(opp_table)) + if (lazy_linking_pending(opp->opp_table)) return 0; /* The required OPP table must belong to a genpd */ - if (unlikely(!opp_table->required_opp_tables[index]->is_genpd)) { + if (unlikely(!opp->opp_table->required_opp_tables[index]->is_genpd)) { pr_err("%s: Performance state is only valid for genpds.\n", __func__); return 0; } -- 2.25.1
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