tree 4eb7d05f8d94adf671ba5f8aa736b9f502e37d21
parent ba87977a49913129962af8ac35b0e13e0fa4382d
author Miklos Szeredi <mszeredi@redhat.com> 1510742098 +0100
committer Al Viro <viro@zeniv.linux.org.uk> 1516433475 -0500

seq_file: fix incomplete reset on read from zero offset

When resetting iterator on a zero offset we need to discard any data
already in the buffer (count), and private state of the iterator (version).

For example this bug results in first line being repeated in /proc/mounts
if doing a zero size read before a non-zero size read.

Reported-by: Rich Felker <dalias@libc.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: e522751d605d ("seq_file: reset iterator to first record for zero offset")
Cc: <stable@vger.kernel.org> # v4.10
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>