The "open" operation in struct file_operations is optional, and
ftrace_event_id_fops does not set it. In default_file_open(), after
all other checks have passed, return 0 if the underlying struct
file_operations does not implement open.
Fixes: 757ff7244358 ("tracefs: Restrict tracefs when the kernel is …")
References: https://bugs.debian.org/934304
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/tracefs/inode.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
index 34da48036e08..761af8ce4015 100644
--- a/fs/tracefs/inode.c
+++ b/fs/tracefs/inode.c
@@ -42,6 +42,8 @@ static int default_open_file(struct inode *inode, struct file *filp)
return ret;
real_fops = dentry->d_fsdata;
+ if (!real_fops->open)
+ return 0;
return real_fops->open(inode, filp);
}
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