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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-03 05:55:23 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-10-15 21:20:42 +0300 |
| commit | 7b84b665c874f60d84547635341e418f20cbbab2 (patch) | |
| tree | 68a8569904410301bbeb6567788a2882d144b504 | |
| parent | 4c207ef48269377236cd38979197c5e1631c8c16 (diff) | |
| download | linux-7b84b665c874f60d84547635341e418f20cbbab2.tar.xz | |
fs: Allow a NULL pos pointer to __kernel_read
Match the behaviour of new_sync_read() and __kernel_write().
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/read_write.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 516eb51af70e..498cc00f3c08 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -449,11 +449,12 @@ ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) return warn_unsupported(file, "read"); init_sync_kiocb(&kiocb, file); - kiocb.ki_pos = *pos; + kiocb.ki_pos = pos ? *pos : 0; iov_iter_kvec(&iter, READ, &iov, 1, iov.iov_len); ret = file->f_op->read_iter(&kiocb, &iter); if (ret > 0) { - *pos = kiocb.ki_pos; + if (pos) + *pos = kiocb.ki_pos; fsnotify_access(file); add_rchar(current, ret); } |