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authorTomi Valkeinen <tomi.valkeinen@ti.com>2014-01-09 16:50:29 +0400
committerLinus Walleij <linus.walleij@linaro.org>2014-01-15 11:31:53 +0400
commitad5d25fef8f9459a9f67ec5fbae94287fdea3247 (patch)
treecde8521539c7cb408ffb7c0c7eb5a47c3ec1532b /drivers/pinctrl/pinctrl-single.c
parentdd4c2b3cb39da587fc1e5a9315d4d894a83ec481 (diff)
downloadlinux-ad5d25fef8f9459a9f67ec5fbae94287fdea3247.tar.xz
pinctrl: single: fix infinite loop caused by bad mask
commit 4e7e8017a80e1 (pinctrl: pinctrl-single: enhance to configure multiple pins of different modules) improved support for pinctrl-single,bits option, but also caused a regression in parsing badly configured mask data. If the masks in DT data are not quite right, pcs_parse_bits_in_pinctrl_entry() can end up in an infinite loop, trashing memory at the same time. Add a check to verify that each loop actually removes bits from the 'mask', so that the loop can eventually end. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-single.c')
-rw-r--r--drivers/pinctrl/pinctrl-single.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 174f4c50cd77..de6459628b4f 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1318,6 +1318,14 @@ static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
mask_pos = ((pcs->fmask) << (bit_pos - 1));
val_pos = val & mask_pos;
submask = mask & mask_pos;
+
+ if ((mask & mask_pos) == 0) {
+ dev_err(pcs->dev,
+ "Invalid mask for %s at 0x%x\n",
+ np->name, offset);
+ break;
+ }
+
mask &= ~mask_pos;
if (submask != mask_pos) {