lkml.org 
[lkml]   [2021]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] firmware: tegra: switch over to memdup_user()
Date
This patch fixes the following Coccinelle warning:

drivers/firmware/tegra/bpmp-debugfs.c:379: WARNING opportunity for memdup_user

Use memdup_user rather than duplicating its implementation
This is a little bit restricted to reduce false positives

Signed-off-by: Qing Wang <wangqing@vivo.com>
---
drivers/firmware/tegra/bpmp-debugfs.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/firmware/tegra/bpmp-debugfs.c b/drivers/firmware/tegra/bpmp-debugfs.c
index 6d66fe0..0435709
--- a/drivers/firmware/tegra/bpmp-debugfs.c
+++ b/drivers/firmware/tegra/bpmp-debugfs.c
@@ -376,18 +376,11 @@ static ssize_t bpmp_debug_store(struct file *file, const char __user *buf,
if (!filename)
return -ENOENT;

- databuf = kmalloc(count, GFP_KERNEL);
- if (!databuf)
- return -ENOMEM;
-
- if (copy_from_user(databuf, buf, count)) {
- err = -EFAULT;
- goto free_ret;
- }
+ databuf = memdup_user(buf, count);
+ if (IS_ERR(databuf))
+ return ERR_PTR(PTR_ERR(databuf));

err = mrq_debug_write(bpmp, filename, databuf, count);
-
-free_ret:
kfree(databuf);

return err ?: count;
--
2.7.4
\
 
 \ /
  Last update: 2021-10-18 10:01    [W:0.038 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site