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Date: Thu, 27 Jul 2017 00:56:27 +0100 From: Colin King <colin.king@...onical.com> To: Tero Kristo <t-kristo@...com>, Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...eaurora.org>, linux-omap@...r.kernel.org, linux-clk@...r.kernel.org Cc: linux-kernel@...r.kernel.org Subject: [PATCH][next] clk: ti: check for null return in strrchr to avoid null dereferencing From: Colin Ian King <colin.king@...onical.com> strrchr can potentially return a null so the following strlen on the null pointer can cause a null dereference. Add a check to see if the string postfix is not null before calling strlen. Detected by CoverityScan, CID#1452039 ("Dereference null return") Signed-off-by: Colin Ian King <colin.king@...onical.com> --- drivers/clk/ti/adpll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clk/ti/adpll.c b/drivers/clk/ti/adpll.c index 255cafb18336..bd7cb9a413c9 100644 --- a/drivers/clk/ti/adpll.c +++ b/drivers/clk/ti/adpll.c @@ -222,7 +222,7 @@ static int ti_adpll_setup_clock(struct ti_adpll_data *d, struct clk *clock, /* Separate con_id in format "pll040dcoclkldo" to fit MAX_CON_ID */ postfix = strrchr(name, '.'); - if (strlen(postfix) > 1) { + if (postfix && strlen(postfix) > 1) { if (strlen(postfix) > ADPLL_MAX_CON_ID) dev_warn(d->dev, "clock %s con_id lookup may fail\n", name); -- 2.11.0
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