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authorChangli Gao <xiaosuo@gmail.com>2009-11-04 09:09:52 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-11-04 09:09:52 +0100
commitcc56f7de7f00d188c7c4da1e9861581853b9e92f (patch)
tree4794c8e5b7c7aec176f695dfc9d723d4a73e3ba9 /fs/read_write.c
parentf21121cde6e617b90cd03ce083652ca543004dc2 (diff)
downloadlinux-cc56f7de7f00d188c7c4da1e9861581853b9e92f.tar.gz
sendfile(): check f_op.splice_write() rather than f_op.sendpage()
sendfile(2) was reworked with the splice infrastructure, but it still checks f_op.sendpage() instead of f_op.splice_write() wrongly. Although if f_op.sendpage() exists, f_op.splice_write() always exists at the same time currently, the assumption will be broken in future silently. This patch also brings a side effect: sendfile(2) can work with any output file. Some security checks related to f_op are added too. Signed-off-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 3ac28987f22..b7f4a1f94d4 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -826,8 +826,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
if (!(out_file->f_mode & FMODE_WRITE))
goto fput_out;
retval = -EINVAL;
- if (!out_file->f_op || !out_file->f_op->sendpage)
- goto fput_out;
in_inode = in_file->f_path.dentry->d_inode;
out_inode = out_file->f_path.dentry->d_inode;
retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);