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authorJan Kara <jack@suse.cz>2012-02-20 17:49:56 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-02 09:27:19 -0700
commitbc9d8a3ba0a4b0c136c78ba5e35906401d7dc5ba (patch)
treef54b9b3d46c3fa8d60dda0227987fbb97071b81b /fs/udf
parent19f490da69bacce1d3b9934116bbff0ae5f50530 (diff)
udf: Fix deadlock in udf_release_file()
commit a0391a3ae91d301c0e59368531a4de5f0b122bcf upstream. 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: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/udf')
-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 0c0c9d33dbc7..3438b0000413 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;
}