wimax/i2400m: fix oops when the TX FIFO fills up due to a missing check

When the TX FIFO filled up and i2400m_tx_new() failed to allocate a
new TX message header, a missing check for said condition was causing a
kernel oops when trying to dereference a NULL i2400m->tx_msg pointer.

Found and diagnosed by Cindy H. Kao.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wimax/i2400m/tx.c b/drivers/net/wimax/i2400m/tx.c
index 4295dcf96ee2..fa16ccf8e26a 100644
--- a/drivers/net/wimax/i2400m/tx.c
+++ b/drivers/net/wimax/i2400m/tx.c
@@ -653,6 +653,8 @@ try_new:
                 i2400m_tx_close(i2400m);
                 i2400m_tx_new(i2400m);
         }
+        if (i2400m->tx_msg == NULL)
+                goto error_tx_new;
         if (i2400m->tx_msg->size + padded_len > I2400M_TX_BUF_SIZE / 2) {
                 d_printf(2, dev, "TX: message too big, going new\n");
                 i2400m_tx_close(i2400m);