n_gsm: gsm_data_alloc buffer allocation could fail and it is not being checked

gsm_data_alloc buffer allocation could fail and it is not being checked.

Add check for allocated buffer and return if the buffer allocation
fails.

Signed-off-by: Ken Mills <ken.k.mills@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 2fc5cf27152a..c5f8e5bda2b2 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -968,6 +968,8 @@ static void gsm_control_reply(struct gsm_mux *gsm, int cmd, u8 *data,
 {
         struct gsm_msg *msg;
         msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype);
+        if (msg == NULL)
+                return;
         msg->data[0] = (cmd & 0xFE) << 1 | EA;  /* Clear C/R */
         msg->data[1] = (dlen << 1) | EA;
         memcpy(msg->data + 2, data, dlen);