diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 68f1813fbdc3..849f459ad078 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1687,6 +1687,10 @@ static ssize_t do_generic_file_read(struct file *filp, loff_t *ppos, unsigned int prev_offset; int error = 0; + if (unlikely(*ppos >= inode->i_sb->s_maxbytes)) + return -EINVAL; + iov_iter_truncate(iter, inode->i_sb->s_maxbytes); + index = *ppos >> PAGE_SHIFT; prev_index = ra->prev_pos >> PAGE_SHIFT; prev_offset = ra->prev_pos & (PAGE_SIZE-1); @@ -1721,7 +1725,9 @@ find_page: * wait_on_page_locked is used to avoid unnecessarily * serialisations and why it's safe. */ - wait_on_page_locked_killable(page); + error = wait_on_page_locked_killable(page); + if (unlikely(error)) + goto readpage_error; if (PageUptodate(page)) goto page_ok; @@ -1935,7 +1941,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) file_accessed(file); retval = mapping->a_ops->direct_IO(iocb, &data); - if (retval > 0) { + if (retval >= 0) { iocb->ki_pos += retval; iov_iter_advance(iter, retval); } |