linux-kernel - [PATCH v4 2/3] staging: dgnc: don't forget to check if ->channels[i] is NULL in dgnc_tty

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Message-Id: <1428423102-29138-2-git-send-email-giedrius.statkevicius@gmail.com>
Date:	Tue,  7 Apr 2015 19:11:41 +0300
From:	Giedrius Statkevičius 
	<giedrius.statkevicius@...il.com>
To:	lidza.louina@...il.com, markh@...pro.net
Cc:	gregkh@...uxfoundation.org, driverdev-devel@...uxdriverproject.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	dan.carpenter@...cle.com, sudipm.mukherjee@...il.com,
	Giedrius Statkevičius 
	<giedrius.statkevicius@...il.com>
Subject: [PATCH v4 2/3] staging: dgnc: don't forget to check if ->channels[i] is NULL in dgnc_tty_uninit()

Add a check if ->channels[i] is NULL because a NULL pointer may be dereferenced
in case one of the allocations failed

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@...il.com>
---
v4: new patch that fixes a bug reported by Dan Carpenter

 drivers/staging/dgnc/dgnc_tty.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 0e48f95..785eb6c 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -403,7 +403,9 @@ void dgnc_tty_uninit(struct dgnc_board *brd)
 		dgnc_BoardsByMajor[brd->SerialDriver.major] = NULL;
 		brd->dgnc_Serial_Major = 0;
 		for (i = 0; i < brd->nasync; i++) {
-			dgnc_remove_tty_sysfs(brd->channels[i]->ch_tun.un_sysfs);
+			if (brd->channels[i])
+				dgnc_remove_tty_sysfs(brd->channels[i]->
+						      ch_tun.un_sysfs);
 			tty_unregister_device(&brd->SerialDriver, i);
 		}
 		tty_unregister_driver(&brd->SerialDriver);
@@ -414,7 +416,9 @@ void dgnc_tty_uninit(struct dgnc_board *brd)
 		dgnc_BoardsByMajor[brd->PrintDriver.major] = NULL;
 		brd->dgnc_TransparentPrint_Major = 0;
 		for (i = 0; i < brd->nasync; i++) {
-			dgnc_remove_tty_sysfs(brd->channels[i]->ch_pun.un_sysfs);
+			if (brd->channels[i])
+				dgnc_remove_tty_sysfs(brd->channels[i]->
+						      ch_pun.un_sysfs);
 			tty_unregister_device(&brd->PrintDriver, i);
 		}
 		tty_unregister_driver(&brd->PrintDriver);
-- 
2.3.5

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