[PATCH] iio: multiplexer: add NULL check on devm_kzalloc() return value

[Gustavo A. R. Silva]

Check return value from call to devm_kzalloc()
in order to prevent a NULL pointer dereference.

This issue was detected using Coccinelle and the following semantic patch:

@@
expression x;
identifier fld;
@@

* x = devm_kzalloc(...);
  ... when != x == NULL
  x->fld


Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
 drivers/iio/multiplexer/iio-mux.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/multiplexer/iio-mux.c 
b/drivers/iio/multiplexer/iio-mux.c
index 37ba007..a8d672b 100644
--- a/drivers/iio/multiplexer/iio-mux.c
+++ b/drivers/iio/multiplexer/iio-mux.c
@@ -285,6 +285,9 @@ static int mux_configure_channel(struct device *dev, struct 
mux *mux,
        child->ext_info_cache = devm_kzalloc(dev,
                                             sizeof(*child->ext_info_cache) *
                                             num_ext_info, GFP_KERNEL);
+       if (!child->ext_info_cache)
+               return -ENOMEM;
+
        for (i = 0; i < num_ext_info; ++i) {
                child->ext_info_cache[i].size = -1;
 
-- 
2.5.0