linux-kernel - [PATCH 09/14] staging: westbridge: improve error path

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Date:	Sun,  5 Sep 2010 22:32:53 +0400
From:	Kulikov Vasiliy <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Vasiliy Kulikov <segooon@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	David Cross <david.cross@...ress.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/14] staging: westbridge: improve error path

From: Vasiliy Kulikov <segooon@...il.com>

kmalloc() may fail, check for it.
Allocated memory is not freed.
Use IS_ERR() instead of strict checking.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 I couldn't compile this driver at all, so it is not tested.

 .../staging/westbridge/astoria/gadget/cyasgadget.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/westbridge/astoria/gadget/cyasgadget.c b/drivers/staging/westbridge/astoria/gadget/cyasgadget.c
index ced239d..48080b3 100644
--- a/drivers/staging/westbridge/astoria/gadget/cyasgadget.c
+++ b/drivers/staging/westbridge/astoria/gadget/cyasgadget.c
@@ -1123,6 +1123,8 @@ static int cyasgadget_ioctl(
 
 		/* better use fixed size buff*/
 		alloc_filename = kmalloc(k_d.name_length + 1, GFP_KERNEL);
+		if (alloc_filename == NULL)
+			return -ENOMEM;
 
 		/* get the filename */
 		if (copy_from_user(alloc_filename, k_d.file_name,
@@ -1132,12 +1134,13 @@ static int cyasgadget_ioctl(
 				"copy file name from user space failed\n",
 				__func__);
 			#endif
+			kfree(alloc_filename);
 			return -EFAULT;
 		}
 
 		file_to_allocate = filp_open(alloc_filename, O_RDWR, 0);
 
-		if ((int)file_to_allocate != 0xfffffffe) {
+		if (!IS_ERR(file_to_allocate)) {
 
 			struct address_space *mapping =
 				file_to_allocate->f_mapping;
@@ -1379,6 +1382,7 @@ static int cyasgadget_ioctl(
 				__func__, alloc_filename);
 		} /* end if (file_to_allocate)*/
 		#endif
+		kfree(alloc_filename);
 initsoj_safe_exit:
 			ret_stat = 0;
 			retval = __put_user(ret_stat,
@@ -1410,12 +1414,15 @@ initsoj_safe_exit:
 				return -EFAULT;
 
 		map_filename = kmalloc(k_d.name_length + 1, GFP_KERNEL);
+		if (map_filename == NULL)
+			return -ENOMEM;
 		if (copy_from_user(map_filename, k_d.file_name,
 			k_d.name_length + 1)) {
 			#ifndef WESTBRIDGE_NDEBUG
 			cy_as_hal_print_message("%s: copy file name from "
 				"user space failed\n", __func__);
 			#endif
+			kfree(map_filename);
 			return -EFAULT;
 		}
 
@@ -1561,6 +1568,7 @@ initsoj_safe_exit:
 					__func__, map_filename);
 		}
 		#endif
+		kfree(map_filename);
 
 		ret_stat = 0;
 		retval = __put_user(ret_stat, (uint32_t __user *)
-- 
1.7.0.4

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