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authorLinus Torvalds <torvalds@linux-foundation.org>2016-02-14 21:29:59 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-02-14 21:29:59 +0100
commit779ee19da757d6bbf5504840f8b624f525de9797 (patch)
treec538becc24cb3a49b59d6ed782160a84dee8c1bb /fs
parentMerge tag 'usb-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/greg... (diff)
parentRevert "8250: uniphier: allow modular build with 8250 console" (diff)
downloadlinux-779ee19da757d6bbf5504840f8b624f525de9797.tar.xz
linux-779ee19da757d6bbf5504840f8b624f525de9797.zip
Merge tag 'tty-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial fixes from Greg KH: "Here are a number of small tty and serial driver fixes for 4.5-rc4 that resolve some reported issues. One of them got reverted as it wasn't correct based on testing, and all have been in linux-next for a while" * tag 'tty-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: Revert "8250: uniphier: allow modular build with 8250 console" pty: make sure super_block is still valid in final /dev/tty close pty: fix possible use after free of tty->driver_data tty: Add support for PCIe WCH382 2S multi-IO card serial/omap: mark wait_for_xmitr as __maybe_unused serial: omap: Prevent DoS using unprivileged ioctl(TIOCSRS485) 8250: uniphier: allow modular build with 8250 console tty: Drop krefs for interrupted tty lock
Diffstat (limited to 'fs')
-rw-r--r--fs/devpts/inode.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 1f107fd51328..655f21f99160 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -575,6 +575,26 @@ void devpts_kill_index(struct inode *ptmx_inode, int idx)
mutex_unlock(&allocated_ptys_lock);
}
+/*
+ * pty code needs to hold extra references in case of last /dev/tty close
+ */
+
+void devpts_add_ref(struct inode *ptmx_inode)
+{
+ struct super_block *sb = pts_sb_from_inode(ptmx_inode);
+
+ atomic_inc(&sb->s_active);
+ ihold(ptmx_inode);
+}
+
+void devpts_del_ref(struct inode *ptmx_inode)
+{
+ struct super_block *sb = pts_sb_from_inode(ptmx_inode);
+
+ iput(ptmx_inode);
+ deactivate_super(sb);
+}
+
/**
* devpts_pty_new -- create a new inode in /dev/pts/
* @ptmx_inode: inode of the master