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>

diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 47bea0b..5fae001 100644 (file)
--- 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++) {