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| author | Herton R. Krzesinski <herton@redhat.com> | 2016-01-11 12:07:43 -0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-25 12:01:14 -0800 |
| commit | 3ceeb564198cf81863c16d76572306e57e833963 (patch) | |
| tree | 727815d05a0dc2a82780c54564675a598a480103 /fs/proc/array.c | |
| parent | a45f23edb00e017289c5263fef25ad920009edb0 (diff) | |
pty: fix possible use after free of tty->driver_data
commit 2831c89f42dcde440cfdccb9fee9f42d54bbc1ef upstream.
This change fixes a bug for a corner case where we have the the last
release from a pty master/slave coming from a previously opened /dev/tty
file. When this happens, the tty->driver_data can be stale, due to all
ptmx or pts/N files having already been closed before (and thus the inode
related to these files, which tty->driver_data points to, being already
freed/destroyed).
The fix here is to keep a reference on the opened master ptmx inode.
We maintain the inode referenced until the final pty_unix98_shutdown,
and only pass this inode to devpts_kill_index.
Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/proc/array.c')
0 files changed, 0 insertions, 0 deletions