Le 21/08/2016 à 11:45, SF Markus Elfring a écrit :
From: Markus Elfring <elfr...@users.sourceforge.net>
Date: Sun, 21 Aug 2016 11:30:57 +0200
Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.
This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfr...@users.sourceforge.net>
---
drivers/staging/lustre/lustre/llite/dir.c | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/drivers/staging/lustre/lustre/llite/dir.c
b/drivers/staging/lustre/lustre/llite/dir.c
index 031c9e4..8b70e42 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -1676,14 +1676,9 @@ out_poll:
case LL_IOC_QUOTACTL: {
struct if_quotactl *qctl;
- qctl = kzalloc(sizeof(*qctl), GFP_NOFS);
Same as previously reported in another patch, GFP_NOFS has not the same
meaning than GPF_KERNEL.
So your proposed clean-up is not 100% equivalent.
Are your sure that GPF_KERNEL instead of GFP_NOFS is right in this code?
Maybe, the coccinelle check should be tweak to only spot "kzalloc(...,
GFP_KERNEL)" allocation?
- if (!qctl)
- return -ENOMEM;
-
- if (copy_from_user(qctl, (void __user *)arg, sizeof(*qctl))) {
- rc = -EFAULT;
- goto out_quotactl;
- }
+ qctl = memdup_user((void __user *)arg, sizeof(*qctl));
+ if (IS_ERR(qctl))
+ return PTR_ERR(qctl);
rc = quotactl_ioctl(sbi, qctl);
@@ -1691,7 +1686,6 @@ out_poll:
sizeof(*qctl)))
rc = -EFAULT;
-out_quotactl:
kfree(qctl);
return rc;
}
---
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