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Subject[PATCH] btrfs: simplify kmalloc+copy_from_user to memdup_user
Date
Use memdup_user rather than duplicating its implementation
This is a little bit restricted to reduce false positives

The semantic patch that makes this report is available
in scripts/coccinelle/api/memdup_user.cocci.

More information about semantic patching is available at
http://coccinelle.lip6.fr/

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
---
fs/btrfs/ioctl.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9d46f60..f0e3517 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2727,15 +2727,10 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
size = sizeof(tmp) +
tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);

- same = kmalloc(size, GFP_NOFS);
- if (!same) {
- ret = -EFAULT;
- goto out;
- }
+ same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);

- if (copy_from_user(same,
- (struct btrfs_ioctl_same_args __user *)argp, size)) {
- ret = -EFAULT;
+ if (IS_ERR(same)) {
+ ret = PTR_ERR(same);
goto out;
}

--
1.8.4


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