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authorAl Viro <viro@zeniv.linux.org.uk>2015-12-24 00:06:05 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2016-01-04 10:26:58 -0500
commit16e5c1fc36040e592128a164499bc25eb138a80f (patch)
treea080bd2eea306d5815c5a9eefb46180e2bedffb2 /fs/afs/proc.c
parent7e935c7ca1e6c398f11edac5beabfc4348e3b3a4 (diff)
convert a bunch of open-coded instances of memdup_user_nul()
A _lot_ of ->write() instances were open-coding it; some are converted to memdup_user_nul(), a lot more remain... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/afs/proc.c')
-rw-r--r--fs/afs/proc.c25
1 files changed, 6 insertions, 19 deletions
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 24a905b076fd..2853b4095344 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -230,14 +230,9 @@ static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
if (size <= 1 || size >= PAGE_SIZE)
return -EINVAL;
- kbuf = kmalloc(size + 1, GFP_KERNEL);
- if (!kbuf)
- return -ENOMEM;
-
- ret = -EFAULT;
- if (copy_from_user(kbuf, buf, size) != 0)
- goto done;
- kbuf[size] = 0;
+ kbuf = memdup_user_nul(buf, size);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
/* trim to first NL */
name = memchr(kbuf, '\n', size);
@@ -315,15 +310,9 @@ static ssize_t afs_proc_rootcell_write(struct file *file,
if (size <= 1 || size >= PAGE_SIZE)
return -EINVAL;
- ret = -ENOMEM;
- kbuf = kmalloc(size + 1, GFP_KERNEL);
- if (!kbuf)
- goto nomem;
-
- ret = -EFAULT;
- if (copy_from_user(kbuf, buf, size) != 0)
- goto infault;
- kbuf[size] = 0;
+ kbuf = memdup_user_nul(buf, size);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
/* trim to first NL */
s = memchr(kbuf, '\n', size);
@@ -337,9 +326,7 @@ static ssize_t afs_proc_rootcell_write(struct file *file,
if (ret >= 0)
ret = size; /* consume everything, always */
-infault:
kfree(kbuf);
-nomem:
_leave(" = %d", ret);
return ret;
}