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authorJan Kara <jack@suse.cz>2012-02-20 17:54:00 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2012-03-10 16:05:38 -0500
commitf6940fe9092e796119af691c7f722c252f4fc524 (patch)
tree648da154cc48352b12982b4407e72121ceac9ecb
parent978d6d8c4574098050b22281b9ed06818c0b23ca (diff)
downloadop-kernel-dev-f6940fe9092e796119af691c7f722c252f4fc524.zip
op-kernel-dev-f6940fe9092e796119af691c7f722c252f4fc524.tar.gz
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: 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: Al Viro <viro@zeniv.linux.org.uk>
-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 dca0c38..d567b84 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;
}
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