pinctrl: single: Add allocation failure checking of saved_vals

Currently saved_vals is being allocated and there is no check for
failed allocation (which is more likely than normal when using
GFP_ATOMIC).  Fix this by checking for a failed allocation and
propagating this error return down the the caller chain.

Detected by CoverityScan, CID#1469841 ("Dereference null return value")
Fixes: 88a1dbdec682 ("pinctrl: pinctrl-single: Add functions to save and restore pinctrl context")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index b3153c095199d3bed84d7b846432fa3e783c08f0..e5647dac0818d46353629a543733fe0af804210b 100644 (file)
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1590,8 +1590,11 @@ static int pcs_save_context(struct pcs_device *pcs)
 
        mux_bytes = pcs->width / BITS_PER_BYTE;
 
-       if (!pcs->saved_vals)
+       if (!pcs->saved_vals) {
                pcs->saved_vals = devm_kzalloc(pcs->dev, pcs->size, GFP_ATOMIC);
+               if (!pcs->saved_vals)
+                       return -ENOMEM;
+       }
 
        switch (pcs->width) {
        case 64:
@@ -1651,8 +1654,13 @@ static int pinctrl_single_suspend(struct platform_device *pdev,
        if (!pcs)
                return -EINVAL;
 
-       if (pcs->flags & PCS_CONTEXT_LOSS_OFF)
-               pcs_save_context(pcs);
+       if (pcs->flags & PCS_CONTEXT_LOSS_OFF) {
+               int ret;
+
+               ret = pcs_save_context(pcs);
+               if (ret < 0)
+                       return ret;
+       }
 
        return pinctrl_force_sleep(pcs->pctl);
 }