From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
eventfs uses the tracefs_inode and assumes that it's already initialized
to zero. That is, it doesn't set fields to zero (like ti->private) after
getting its tracefs_inode. This causes bugs due to stale values.
Just initialize the entire structure to zero on allocation so there isn't
any more surprises.
This is a partial fix for accessing ti->private. The assignment still needs
to be made before the dentry is instantiated.
Cc: stable@vger.kernel.org
Fixes: 5790b1fb3d672 ("eventfs: Remove eventfs_file and just use eventfs_inode")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202401291043.e62e89dc-oliver.sang@intel.com
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
fs/tracefs/inode.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
index e1b172c0e091..f7cde61ff2fc 100644
--- a/fs/tracefs/inode.c
+++ b/fs/tracefs/inode.c
@@ -34,12 +34,10 @@ static struct inode *tracefs_alloc_inode(struct super_block *sb)
{
struct tracefs_inode *ti;
- ti = kmem_cache_alloc(tracefs_inode_cachep, GFP_KERNEL);
+ ti = kmem_cache_alloc(tracefs_inode_cachep, GFP_KERNEL | __GFP_ZERO);
if (!ti)
return NULL;
- ti->flags = 0;
-
return &ti->vfs_inode;
}
--
2.43.0