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eventfs: Check for NULL ef in eventfs_set_attr() 

The top level events directory dentry does not have a d_fsdata set to a
eventfs_file pointer. This dentry is still passed to eventfs_set_attr().
It can not assume that the d_fsdata is set. Check for that.

Link: https://lore.kernel.org/all/20231112104158.6638-1-milian.wolff@kdab.com/

Fixes: 9aaee3eebc ("eventfs: Save ownership and mode")
Reported-by: Milian Wolff <milian.wolff@kdab.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Google) 2023-11-12 12:18:17 -05:00 committed by Greg Kroah-Hartman
parent dc43609d12
commit d8f492a059
1 changed files with 2 additions and 2 deletions
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4
fs/tracefs/event_inode.c
View File

@ -113,14 +113,14 @@ static int eventfs_set_attr(struct mnt_idmap *idmap, struct dentry *dentry,
mutex_lock(&eventfs_mutex);
ef = dentry->d_fsdata;
if (ef->is_freed) {
if (ef && ef->is_freed) {
/* Do not allow changes if the event is about to be removed. */
mutex_unlock(&eventfs_mutex);
return -ENODEV;
}
ret = simple_setattr(idmap, dentry, iattr);
if (!ret)
if (!ret && ef)
update_attr(ef, iattr);
mutex_unlock(&eventfs_mutex);
return ret;