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authorJan Kara <jack@suse.cz>2012-02-20 17:49:56 +0100
committerJan Kara <jack@suse.cz>2012-02-29 21:53:48 +0100
commita0391a3ae91d301c0e59368531a4de5f0b122bcf (patch)
tree26425274ff44d43a1a369bf91c7cc5a78756b30d
parentb2527bfa535956d99663718b9d9aac0b8fe3f017 (diff)
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. CC: stable@vger.kernel.org (2.6.38 & later) Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/udf/file.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/udf/file.c b/fs/udf/file.c
index dca0c3881e8..d567b8448df 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -201,12 +201,10 @@ out:
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;
}