NFC: st-nci: fix use of uninitialized variables in error path
st_nci_hci_load_session() calls kfree_skb() on unitialized
variables skb_pipe_info and skb_pipe_list if the call to
nci_hci_connect_gate() failed. Reword the error path to not use
these variables when they are not initialized. While at it, there
seemed to be a memory leak because skb_pipe_info was only freed
once, after the for-loop, even though several ones were created
by nci_hci_send_cmd.
Cc: stable@vger.kernel.org
Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/nfc/st-nci/st-nci_se.c b/drivers/nfc/st-nci/st-nci_se.c
index 97addfa9..c742ef6 100644
--- a/drivers/nfc/st-nci/st-nci_se.c
+++ b/drivers/nfc/st-nci/st-nci_se.c
@@ -189,14 +189,14 @@
ST_NCI_DEVICE_MGNT_GATE,
ST_NCI_DEVICE_MGNT_PIPE);
if (r < 0)
- goto free_info;
+ return r;
/* Get pipe list */
r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
&skb_pipe_list);
if (r < 0)
- goto free_info;
+ return r;
/* Complete the existing gate_pipe table */
for (i = 0; i < skb_pipe_list->len; i++) {
@@ -222,6 +222,7 @@
dm_pipe_info->src_host_id != ST_NCI_ESE_HOST_ID) {
pr_err("Unexpected apdu_reader pipe on host %x\n",
dm_pipe_info->src_host_id);
+ kfree_skb(skb_pipe_info);
continue;
}
@@ -241,13 +242,12 @@
ndev->hci_dev->pipes[st_nci_gates[j].pipe].host =
dm_pipe_info->src_host_id;
}
+ kfree_skb(skb_pipe_info);
}
memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
sizeof(st_nci_gates));
-free_info:
- kfree_skb(skb_pipe_info);
kfree_skb(skb_pipe_list);
return r;
}