[PATCH][next] pinctrl: pinctrl-single: add allocation failure checking of saved_vals

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

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.k...@canonical.com>
---
 drivers/pinctrl/pinctrl-single.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 9c3c00515aa0..0905ee002041 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1588,8 +1588,11 @@ 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:
@@ -1649,8 +1652,13 @@ 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);
 }
-- 
2.17.0