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fuse: zero initialize inode private data

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[ Upstream commit 3ca1b311181072415b6432a169de765ac2034e5a ]

This is slightly tricky, since the VFS uses non-zeroing allocation to
preserve some fields that are left in a consistent state.

Reported-by: Chunsheng Luo <luochunsheng@ustc.edu>
Closes: https://lore.kernel.org/all/20250818083224.229-1-luochunsheng@ustc.edu/
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miklos Szeredi
2025-08-19 16:44:02 +02:00
committed by Greg Kroah-Hartman
parent bb9b505f02
commit a7953bf985
1 changed files with 4 additions and 7 deletions
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11
fs/fuse/inode.c
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@@ -94,14 +94,11 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
if (!fi)
return NULL;
fi->i_time = 0;
/* Initialize private data (i.e. everything except fi->inode) */
BUILD_BUG_ON(offsetof(struct fuse_inode, inode) != 0);
memset((void *) fi + sizeof(fi->inode), 0, sizeof(*fi) - sizeof(fi->inode));
fi->inval_mask = ~0;
fi->nodeid = 0;
fi->nlookup = 0;
fi->attr_version = 0;
fi->orig_ino = 0;
fi->state = 0;
fi->submount_lookup = NULL;
mutex_init(&fi->mutex);
spin_lock_init(&fi->lock);
fi->forget = fuse_alloc_forget();