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authorAl Viro <viro@zeniv.linux.org.uk>2013-06-20 18:58:36 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-06-20 19:02:45 +0400
commit7995bd287134f6c8f80d94bebe7396f05a9bc42b (patch)
tree7e94bb13bb30b8549892ed93e0e5b11d8b642bc2 /fs/splice.c
parentc9036e9f3b2b77f678572260e1ef1075fcb08c36 (diff)
downloadop-kernel-dev-7995bd287134f6c8f80d94bebe7396f05a9bc42b.zip
op-kernel-dev-7995bd287134f6c8f80d94bebe7396f05a9bc42b.tar.gz
splice: don't pass the address of ->f_pos to methods
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/splice.c')
-rw-r--r--fs/splice.c31
1 files changed, 18 insertions, 13 deletions
diff --git a/fs/splice.c b/fs/splice.c
index e6b2559..9eca476 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1274,7 +1274,7 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
{
struct file *file = sd->u.file;
- return do_splice_from(pipe, file, &file->f_pos, sd->total_len,
+ return do_splice_from(pipe, file, sd->opos, sd->total_len,
sd->flags);
}
@@ -1294,7 +1294,7 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
*
*/
long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
- size_t len, unsigned int flags)
+ loff_t *opos, size_t len, unsigned int flags)
{
struct splice_desc sd = {
.len = len,
@@ -1302,6 +1302,7 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
.flags = flags,
.pos = *ppos,
.u.file = out,
+ .opos = opos,
};
long ret;
@@ -1325,7 +1326,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
{
struct pipe_inode_info *ipipe;
struct pipe_inode_info *opipe;
- loff_t offset, *off;
+ loff_t offset;
long ret;
ipipe = get_pipe_info(in);
@@ -1356,13 +1357,15 @@ static long do_splice(struct file *in, loff_t __user *off_in,
return -EINVAL;
if (copy_from_user(&offset, off_out, sizeof(loff_t)))
return -EFAULT;
- off = &offset;
- } else
- off = &out->f_pos;
+ } else {
+ offset = out->f_pos;
+ }
- ret = do_splice_from(ipipe, out, off, len, flags);
+ ret = do_splice_from(ipipe, out, &offset, len, flags);
- if (off_out && copy_to_user(off_out, off, sizeof(loff_t)))
+ if (!off_out)
+ out->f_pos = offset;
+ else if (copy_to_user(off_out, &offset, sizeof(loff_t)))
ret = -EFAULT;
return ret;
@@ -1376,13 +1379,15 @@ static long do_splice(struct file *in, loff_t __user *off_in,
return -EINVAL;
if (copy_from_user(&offset, off_in, sizeof(loff_t)))
return -EFAULT;
- off = &offset;
- } else
- off = &in->f_pos;
+ } else {
+ offset = in->f_pos;
+ }
- ret = do_splice_to(in, off, opipe, len, flags);
+ ret = do_splice_to(in, &offset, opipe, len, flags);
- if (off_in && copy_to_user(off_in, off, sizeof(loff_t)))
+ if (!off_in)
+ in->f_pos = offset;
+ else if (copy_to_user(off_in, &offset, sizeof(loff_t)))
ret = -EFAULT;
return ret;
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