lkml.org 
[lkml]   [2017]   [Apr]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] pstore: use memdup_user
Date
Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
---
fs/pstore/platform.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 43b3ca5..903e0fe 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -640,19 +640,16 @@ static int pstore_write_user_compat(struct pstore_record *record,
if (record->buf)
return -EINVAL;

- record->buf = kmalloc(record->size, GFP_KERNEL);
- if (!record->buf)
- return -ENOMEM;
-
- if (unlikely(copy_from_user(record->buf, buf, record->size))) {
- ret = -EFAULT;
+ record->buf = memdup_user(buf, record->size);
+ if (unlikely(IS_ERR(record->buf))) {
+ ret = PTR_ERR(record->buf);
goto out;
}

ret = record->psi->write(record);

-out:
kfree(record->buf);
+out:
record->buf = NULL;

return unlikely(ret < 0) ? ret : record->size;
--
2.9.3
\
 
 \ /
  Last update: 2017-04-29 03:48    [W:0.107 / U:0.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site