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authorJan Kara <jack@suse.cz>2009-08-07 00:27:27 +0200
committerJan Kara <jack@suse.cz>2009-09-14 19:13:01 +0200
commitcbc8cc33529b0e0e55ae0ff077b8cb0b71d54c7a (patch)
tree5edace261ca6d707456d1bde03c0bf719ac8a365 /fs
parent81056dd04465902461b627169c4b4487a11acba1 (diff)
downloadlinux-linaro-stable-cbc8cc33529b0e0e55ae0ff077b8cb0b71d54c7a.tar.gz
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 <jack@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/udf/file.c2
1 files changed, 2 insertions, 0 deletions
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;
}