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clk: ti: check for null return in strrchr to avoid null dereferencing 

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@canonical.com>
Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Colin Ian King 2017-07-27 00:56:27 +01:00 committed by Stephen Boyd
parent 2316a7a334
commit df2f845167
1 changed files with 1 additions and 1 deletions
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2
drivers/clk/ti/adpll.c
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@ -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 */ /* Separate con_id in format "pll040dcoclkldo" to fit MAX_CON_ID */
postfix = strrchr(name, '.'); postfix = strrchr(name, '.');
if (strlen(postfix) > 1) { if (postfix && strlen(postfix) > 1) {
if (strlen(postfix) > ADPLL_MAX_CON_ID) if (strlen(postfix) > ADPLL_MAX_CON_ID)
dev_warn(d->dev, "clock %s con_id lookup may fail\n", dev_warn(d->dev, "clock %s con_id lookup may fail\n",
name); name);