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[PATCH] Fix missing ret assignment in __bio_map_user() error path 

If get_user_pages() returns less pages than what we asked for, we jump
to out_unmap which will return ERR_PTR(ret).  But ret can contain a
positive number just smaller than local_nr_pages, so be sure to set it
to -EFAULT always.

Problem found and diagnosed by Damien Le Moal <damien@sdl.hitachi.co.jp>

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe 2006-06-16 13:02:29 +02:00 committed by Linus Torvalds
parent 16070428d3
commit 991721572e
1 changed files with 3 additions and 2 deletions
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5
fs/bio.c
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@ -654,9 +654,10 @@ static struct bio *__bio_map_user_iov(request_queue_t *q,
write_to_vm, 0, &pages[cur_page], NULL);
up_read(&current->mm->mmap_sem);
if (ret < local_nr_pages)
if (ret < local_nr_pages) {
ret = -EFAULT;
goto out_unmap;
}
offset = uaddr & ~PAGE_MASK;
for (j = cur_page; j < page_limit; j++) {