linux-kernel - [PATCH v2] staging: dgnc: check if kzalloc fails in dgnc_tty

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Message-Id: <1428410417-18524-1-git-send-email-giedrius.statkevicius@gmail.com>
Date:	Tue,  7 Apr 2015 15:40:17 +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,
	sudipm.mukherjee@...il.com,
	Giedrius Statkevičius 
	<giedrius.statkevicius@...il.com>
Subject: [PATCH v2] staging: dgnc: check if kzalloc fails in dgnc_tty_init()

If one of the allocations of memory for storing a channel information struct
fails then free all the successful allocations and return -ENOMEM that gets
propogated to the pci layer.  Also, remove a bogus skipping in the next part of
the initiation if a previous memory allocation failed because we won't execute
that if any of the allocations failed.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@...il.com>
---
v2: Only returning -ENOMEM if an allocation failed isn't enough as it was
spotted by Sudip so create a new label that frees all successfully allocated
stuff and only then returns -ENOMEM. Also, remove a unnecessary check in the
next loop.

 drivers/staging/dgnc/dgnc_tty.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index ce4187f..60d7e49 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -316,6 +316,8 @@ int dgnc_tty_init(struct dgnc_board *brd)
 			 * interrupt context, and there are no locks held.
 			 */
 			brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), GFP_KERNEL);
+			if (!brd->channels[i])
+				goto err_free_channels;
 		}
 	}
 
@@ -324,10 +326,6 @@ int dgnc_tty_init(struct dgnc_board *brd)
 
 	/* Set up channel variables */
 	for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
-
-		if (!brd->channels[i])
-			continue;
-
 		spin_lock_init(&ch->ch_lock);
 
 		/* Store all our magic numbers */
@@ -375,6 +373,11 @@ int dgnc_tty_init(struct dgnc_board *brd)
 	}
 
 	return 0;
+
+err_free_channels:
+	for (i = i - 1; i >= 0; --i)
+		kfree(brd->channels[i]);
+	return -ENOMEM;
 }
 
 
-- 
2.3.5

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