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eCryptfs: Return error when lower file pointer is NULL

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When an eCryptfs inode's lower file has been closed, and the pointer has
been set to NULL, return an error when trying to do a lower read or
write rather than calling BUG().

https://bugzilla.kernel.org/show_bug.cgi?id=37292

Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Cc: <stable@kernel.org>
This commit is contained in:
Tyler Hicks 2011-08-04 22:58:51 -05:00
parent 322a8b0340
commit f61500e000
1 changed files with 10 additions and 8 deletions
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18
fs/ecryptfs/read_write.c
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@ -39,15 +39,16 @@
int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
loff_t offset, size_t size)
{
struct ecryptfs_inode_info *inode_info;
struct file *lower_file;
mm_segment_t fs_save;
ssize_t rc;
inode_info = ecryptfs_inode_to_private(ecryptfs_inode);
BUG_ON(!inode_info->lower_file);
lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
if (!lower_file)
return -EIO;
fs_save = get_fs();
set_fs(get_ds());
rc = vfs_write(inode_info->lower_file, data, size, &offset);
rc = vfs_write(lower_file, data, size, &offset);
set_fs(fs_save);
mark_inode_dirty_sync(ecryptfs_inode);
return rc;
@ -225,15 +226,16 @@ out:
int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
struct inode *ecryptfs_inode)
{
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_inode);
struct file *lower_file;
mm_segment_t fs_save;
ssize_t rc;
BUG_ON(!inode_info->lower_file);
lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
if (!lower_file)
return -EIO;
fs_save = get_fs();
set_fs(get_ds());
rc = vfs_read(inode_info->lower_file, data, size, &offset);
rc = vfs_read(lower_file, data, size, &offset);
set_fs(fs_save);
return rc;
}