[PATCH net] ice: Add check for kzalloc
From: Jiasheng Jiang
Date: Mon Dec 05 2022 - 22:08:29 EST
As kzalloc may fail and return NULL pointer,
it should be better to check the return value
in order to avoid the NULL pointer dereference.
Fixes: d6b98c8d242a ("ice: add write functionality for GNSS TTY")
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
---
drivers/net/ethernet/intel/ice/ice_gnss.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
index b5a7f246d230..6d3d5e75726b 100644
--- a/drivers/net/ethernet/intel/ice/ice_gnss.c
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
@@ -421,7 +421,7 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
const int ICE_TTYDRV_NAME_MAX = 14;
struct tty_driver *tty_driver;
char *ttydrv_name;
- unsigned int i;
+ unsigned int i, j;
int err;
tty_driver = tty_alloc_driver(ICE_GNSS_TTY_MINOR_DEVICES,
@@ -462,6 +462,17 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
GFP_KERNEL);
pf->gnss_serial[i] = NULL;
+ if (!pf->gnss_tty_port[i]) {
+ for (j = 0; j < i; j++) {
+ tty_port_destroy(pf->gnss_tty_port[j]);
+ kfree(pf->gnss_tty_port[j]);
+ }
+ kfree(ttydrv_name);
+ tty_driver_kref_put(pf->ice_gnss_tty_driver);
+
+ return NULL;
+ }
+
tty_port_init(pf->gnss_tty_port[i]);
tty_port_link_device(pf->gnss_tty_port[i], tty_driver, i);
}
--
2.25.1