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[PATCH 12/17] s390/debug: Use memdup_user() rather than duplicating its implementation

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From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 2 Sep 2016 08:45:26 +0200

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 arch/s390/kernel/debug.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index 4a12faf..a9fcf72 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -1162,13 +1162,9 @@ debug_get_user_string(const char __user *user_buf, size_t user_len)
 {
 	char* buffer;
 
-	buffer = kmalloc(user_len + 1, GFP_KERNEL);
-	if (!buffer)
-		return ERR_PTR(-ENOMEM);
-	if (copy_from_user(buffer, user_buf, user_len) != 0) {
-		kfree(buffer);
-		return ERR_PTR(-EFAULT);
-	}
+	buffer = memdup_user(user_buf, user_len + 1);
+	if (IS_ERR(buffer))
+		return PTR_ERR(buffer);
 	/* got the string, now strip linefeed. */
 	if (buffer[user_len - 1] == '\n')
 		buffer[user_len - 1] = 0;
-- 
2.9.3

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[PATCH 00/17] s390/debug: Fine-tuning for several function  implementations SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:10 +0200
  [PATCH 01/17] s390/debug: Use kmalloc_array() in debug_areas_alloc() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:20 +0200
  [PATCH 04/17] s390/debug: Rename jump labels in debug_areas_alloc() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:20 +0200
  [PATCH 02/17] s390/debug: Delete unnecessary braces SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:20 +0200
  [PATCH 05/17] s390/debug: Fix jump targets in debug_info_alloc() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:20 +0200
  [PATCH 06/17] s390/debug: Rename jump labels in debug_info_copy() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
  [PATCH 07/17] s390/debug: Rename jump labels in debug_open() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
  [PATCH 10/17] s390/debug: Delete an unnecessary initialisation in  debug_prolog_level_fn() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
  [PATCH 08/17] s390/debug: Fix a jump target in debug_register_mode() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
  [PATCH 09/17] s390/debug: Return directly if a null pointer was  passed to debug_unregister() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
    Re: [PATCH 09/17] s390/debug: Return directly if a null pointer was  passed to debug_unregister() walter harms <wharms@bfs.de> - 2016-09-03 14:50 +0200
  [PATCH 11/17] s390/debug: Fix indentation in 13 functions SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
  [PATCH 03/17] s390/debug: Add some spaces for better code readability SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:30 +0200
  [PATCH 16/17] s390/debug: Improve determination of sizes in  debug_info_alloc() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:40 +0200
  [PATCH 13/17] s390/debug: Improve a size determination in  debug_open() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:40 +0200
  [PATCH 14/17] s390/debug: Improve a size determination in  debug_sprintf_format_fn() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:40 +0200
  [PATCH 12/17] s390/debug: Use memdup_user() rather than duplicating  its implementation SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:40 +0200
  [PATCH 17/17] s390/debug: Improve another size determination in  debug_info_alloc() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:50 +0200
  [PATCH 15/17] s390/debug: Improve a size determination in  debug_raw_header_fn() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-03 14:50 +0200
  Re: [PATCH 00/17] s390/debug: Fine-tuning for several function  implementations Martin Schwidefsky <schwidefsky@de.ibm.com> - 2016-09-05 12:40 +0200
    Re: s390/debug: Fine-tuning for several function implementations SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-05 12:50 +0200

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