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| author | Tyler Hicks <tyhicks@canonical.com> | 2013-11-13 10:09:42 -0800 |
|---|---|---|
| committer | Tyler Hicks <tyhicks@canonical.com> | 2013-11-14 12:12:15 -0800 |
| commit | 2000f5beabc9c6baf084de5f7879975408e3652c (patch) | |
| tree | 73840a7dd710710ef203cade2cfc31e873d28abb /fs/ecryptfs | |
| parent | 42a2d923cc349583ebf6fdd52a7d35e1c2f7e6bd (diff) | |
| download | lwn-2000f5beabc9c6baf084de5f7879975408e3652c.tar.gz lwn-2000f5beabc9c6baf084de5f7879975408e3652c.zip | |
eCryptfs: file->private_data is always valid
When accessing the lower_file pointer located in private_data of
eCryptfs files, there is no need to check to see if the private_data
pointer has been initialized to a non-NULL value. The file->private_data
and file->private_data->lower_file pointers are always initialized to
non-NULL values in ecryptfs_open().
This change quiets a Smatch warning:
CHECK /var/scm/kernel/linux/fs/ecryptfs/file.c
fs/ecryptfs/file.c:321 ecryptfs_unlocked_ioctl() error: potential NULL dereference 'lower_file'.
fs/ecryptfs/file.c:335 ecryptfs_compat_ioctl() error: potential NULL dereference 'lower_file'.
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Geyslan G. Bem <geyslan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ecryptfs')
| -rw-r--r-- | fs/ecryptfs/file.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index 2229a74aeeed..b1eaa7a1f82c 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -313,11 +313,9 @@ static int ecryptfs_fasync(int fd, struct file *file, int flag) static long ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - struct file *lower_file = NULL; + struct file *lower_file = ecryptfs_file_to_lower(file); long rc = -ENOTTY; - if (ecryptfs_file_to_private(file)) - lower_file = ecryptfs_file_to_lower(file); if (lower_file->f_op->unlocked_ioctl) rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg); return rc; @@ -327,11 +325,9 @@ ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) static long ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - struct file *lower_file = NULL; + struct file *lower_file = ecryptfs_file_to_lower(file); long rc = -ENOIOCTLCMD; - if (ecryptfs_file_to_private(file)) - lower_file = ecryptfs_file_to_lower(file); if (lower_file->f_op && lower_file->f_op->compat_ioctl) rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg); return rc; |