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ANDROID: fuse-bpf: Fix use of get_fuse_inode

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get_fuse_inode uses container_of, which results in a strange result if
the inode is NULL. We should check if the inode is NULL instead.

Fixes: 4ad093cae1 ("ANDROID: fuse-bpf: Make inodes with backing_fd reachable")
Bug: 219958836
Change-Id: I386c4641edaa4dbc8d8e02f592c959c206851eda
Signed-off-by: Daniel Rosenberg <drosen@google.com>
This commit is contained in:
Daniel Rosenberg
2022-07-13 15:50:52 -07:00
parent 81a1ae6b43
commit 55f267ee04
1 changed files with 6 additions and 6 deletions
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12
fs/fuse/backing.c
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@@ -262,7 +262,7 @@ int fuse_create_open_backing(
struct dentry *newent;
int err = 0;
const struct fuse_create_in *fci = fa->in_args[0].value;
struct fuse_inode *fuse_inode = get_fuse_inode(entry->d_inode);
struct inode *d_inode = entry->d_inode;
u64 target_nodeid = 0;
if (!dir_fuse_inode || !dir_fuse_dentry)
@@ -295,8 +295,8 @@ int fuse_create_open_backing(
};
path_get(&get_fuse_dentry(entry)->backing_path);
if (fuse_inode)
target_nodeid = fuse_inode->nodeid;
if (d_inode)
target_nodeid = get_fuse_inode(d_inode)->nodeid;
inode = fuse_iget_backing(dir->i_sb, target_nodeid,
get_fuse_dentry(entry)->backing_path.dentry->d_inode);
@@ -1178,7 +1178,7 @@ struct dentry *fuse_lookup_finalize(struct fuse_bpf_args *fa, struct inode *dir,
struct fuse_dentry *fd;
struct dentry *bd;
struct inode *inode, *backing_inode;
struct fuse_inode *fuse_inode = get_fuse_inode(entry->d_inode);
struct inode *d_inode = entry->d_inode;
struct fuse_entry_out *feo = fa->out_args[0].value;
struct fuse_entry_bpf_out *febo = fa->out_args[1].value;
struct fuse_entry_bpf *feb = container_of(febo, struct fuse_entry_bpf, out);
@@ -1194,8 +1194,8 @@ struct dentry *fuse_lookup_finalize(struct fuse_bpf_args *fa, struct inode *dir,
if (!backing_inode)
return 0;
if (fuse_inode)
target_nodeid = fuse_inode->nodeid;
if (d_inode)
target_nodeid = get_fuse_inode(d_inode)->nodeid;
inode = fuse_iget_backing(dir->i_sb, target_nodeid, backing_inode);