From cbc8cc33529b0e0e55ae0ff077b8cb0b71d54c7a Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Fri, 7 Aug 2009 00:27:27 +0200 Subject: [PATCH] udf: Fix possible corruption when close races with write When we close a file, we remove preallocated blocks from it. But this truncation was not protected by i_mutex and thus it could have raced with a write through a different fd and cause crashes or even filesystem corruption. Signed-off-by: Jan Kara --- fs/udf/file.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/udf/file.c b/fs/udf/file.c index 7464305382b5..b80cbd78833c 100644 --- a/fs/udf/file.c +++ b/fs/udf/file.c @@ -193,9 +193,11 @@ int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, static int udf_release_file(struct inode *inode, struct file *filp) { if (filp->f_mode & FMODE_WRITE) { + mutex_lock(&inode->i_mutex); lock_kernel(); udf_discard_prealloc(inode); unlock_kernel(); + mutex_unlock(&inode->i_mutex); } return 0; } -- 2.20.1