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authorAndi Shyti <andi.shyti@samsung.com>2016-07-06 06:01:26 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-13 15:28:25 -0300
commit8e5fa4c67d6387d40e2ae350e96fca939ba5e681 (patch)
tree366b2860825d9a3b0338d553dd258c46a63622c1
parent62e92682c08885e91113ba742573e736c85db0e4 (diff)
[media] lirc_dev: fix potential segfault
When opening or closing a lirc character device, the framework provides to the user the possibility to keep track of opening or closing of the device by calling two functions: - set_use_inc() when opening the device - set_use_dec() when closing the device if those are not set by the lirc user, the system segfaults. Check the pointer value before calling the above functions. Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
-rw-r--r--drivers/media/rc/lirc_dev.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index 4be447070fc4..a107ab6bcb88 100644
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -411,7 +411,10 @@ int lirc_unregister_driver(int minor)
ir->d.name, ir->d.minor);
wake_up_interruptible(&ir->buf->wait_poll);
mutex_lock(&ir->irctl_lock);
- ir->d.set_use_dec(ir->d.data);
+
+ if (ir->d.set_use_dec)
+ ir->d.set_use_dec(ir->d.data);
+
module_put(cdev->owner);
mutex_unlock(&ir->irctl_lock);
} else {
@@ -469,7 +472,8 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file)
cdev = ir->cdev;
if (try_module_get(cdev->owner)) {
ir->open++;
- retval = ir->d.set_use_inc(ir->d.data);
+ if (ir->d.set_use_inc)
+ retval = ir->d.set_use_inc(ir->d.data);
if (retval) {
module_put(cdev->owner);
@@ -510,7 +514,8 @@ int lirc_dev_fop_close(struct inode *inode, struct file *file)
ir->open--;
if (ir->attached) {
- ir->d.set_use_dec(ir->d.data);
+ if (ir->d.set_use_dec)
+ ir->d.set_use_dec(ir->d.data);
module_put(cdev->owner);
} else {
lirc_irctl_cleanup(ir);

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