Commit f6940fe9 authored by Jan Kara's avatar Jan Kara Committed by Al Viro

udf: Fix deadlock in udf_release_file()

udf_release_file() can be called from munmap() path with mmap_sem held.  Thus
we cannot take i_mutex there because that ranks above mmap_sem. Luckily,
i_mutex is not needed in udf_release_file() anymore since protection by
i_data_sem is enough to protect from races with write and truncate.
Reported-by: default avatarAl Viro <viro@ZenIV.linux.org.uk>
Reviewed-by: default avatarNamjae Jeon <linkinjeon@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 978d6d8c
......@@ -201,12 +201,10 @@ long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
static int udf_release_file(struct inode *inode, struct file *filp)
{
if (filp->f_mode & FMODE_WRITE) {
mutex_lock(&inode->i_mutex);
down_write(&UDF_I(inode)->i_data_sem);
udf_discard_prealloc(inode);
udf_truncate_tail_extent(inode);
up_write(&UDF_I(inode)->i_data_sem);
mutex_unlock(&inode->i_mutex);
}
return 0;
}
......
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