seq_file: fix big-enough lseek() + read()
lseek() further than length of the file will leave stale ->index
(second-to-last during iteration). Next seq_read() will not notice
that ->f_pos is big enough to return 0, but will print last item
as if ->f_pos is pointing to it.
Introduced in commit cb510b8172602a66467f3551b4be1911f5a7c8c2
aka "seq_file: more atomicity in traverse()".
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 2716c12..5267098 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -102,6 +102,7 @@
p = m->op->next(m, p, &index);
}
m->op->stop(m, p);
+ m->index = index;
return error;
Eoverflow: