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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/cachefiles
parent7e935c7ca1e6c398f11edac5beabfc4348e3b3a4 (diff)
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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/cachefiles')
-rw-r--r--fs/cachefiles/daemon.c12
1 files changed, 3 insertions, 9 deletions
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index f601def05bdf..452e98dd7560 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -226,15 +226,9 @@ static ssize_t cachefiles_daemon_write(struct file *file,
return -EOPNOTSUPP;
/* drag the command string into the kernel so we can parse it */
- data = kmalloc(datalen + 1, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- ret = -EFAULT;
- if (copy_from_user(data, _data, datalen) != 0)
- goto error;
-
- data[datalen] = '\0';
+ data = memdup_user_nul(_data, datalen);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
ret = -EINVAL;
if (memchr(data, '\0', datalen))