mac80211: check for allocation failure in debugfs code

kmalloc() can fail.  Also let's move the allocation out of the
declaration block so it's easier to read.

Fixes: 4a5eccaa9350 ("mac80211: Show pending txqlen in debugfs.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 47bea0babe78..5fae001f286c 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -249,12 +249,19 @@ static ssize_t misc_read(struct file *file, char __user *user_buf,
         struct ieee80211_local *local = file->private_data;
         /* Max len of each line is 16 characters, plus 9 for 'pending:\n' */
         size_t bufsz = IEEE80211_MAX_QUEUES * 16 + 9;
-        char *buf = kzalloc(bufsz, GFP_KERNEL);
-        char *pos = buf, *end = buf + bufsz - 1;
+        char *buf;
+        char *pos, *end;
         ssize_t rv;
         int i;
         int ln;
 
+        buf = kzalloc(bufsz, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        pos = buf;
+        end = buf + bufsz - 1;
+
         pos += scnprintf(pos, end - pos, "pending:\n");
 
         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {