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vfs/splice: Fix missed checks in new __kernel_write() helper 

Commit 06ae43f34b ("Don't bother with redoing rw_verify_area() from
default_file_splice_from()") lost the checks to test existence of the
write/aio_write methods.  My apologies ;-/

Eventually, we want that in fs/splice.c side of things (no point
repeating it for every buffer, after all), but for now this is the
obvious minimal fix.

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2013-03-27 15:20:30 +00:00 committed by Linus Torvalds
parent de55eb1d60
commit 3e84f48edf
1 changed files with 3 additions and 0 deletions
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3
fs/read_write.c
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@ -424,6 +424,9 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
const char __user *p;
ssize_t ret;
if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
return -EINVAL;
old_fs = get_fs();
set_fs(get_ds());
p = (__force const char __user *)buf;