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fs/9p: fix errors found in 6.9-rc1

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Two of these fix syzbot reported issues, and
 the other fixes a unused variable in some configurations.
 
 Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
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Merge tag '9p-fixes-for-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Pull 9p fixes from Eric Van Hensbergen:
 "Two of these fix syzbot reported issues, and the other fixes a unused
  variable in some configurations"

* tag '9p-fixes-for-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  fs/9p: fix uninitialized values during inode evict
  fs/9p: remove redundant pointer v9ses
  fs/9p: fix uaf in in v9fs_stat2inode_dotl
This commit is contained in:
Linus Torvalds 2024-03-27 14:53:56 -07:00
commit 4076fa1612
2 changed files with 11 additions and 11 deletions
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16
fs/9p/vfs_inode.c
View File

@ -344,17 +344,21 @@ void v9fs_evict_inode(struct inode *inode)
struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode);
__le32 __maybe_unused version;
truncate_inode_pages_final(&inode->i_data);
if (!is_bad_inode(inode)) {
truncate_inode_pages_final(&inode->i_data);
version = cpu_to_le32(v9inode->qid.version);
netfs_clear_inode_writeback(inode, &version);
version = cpu_to_le32(v9inode->qid.version);
netfs_clear_inode_writeback(inode, &version);
clear_inode(inode);
filemap_fdatawrite(&inode->i_data);
clear_inode(inode);
filemap_fdatawrite(&inode->i_data);
#ifdef CONFIG_9P_FSCACHE
fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
if (v9fs_inode_cookie(v9inode))
fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
#endif
} else
clear_inode(inode);
}
struct inode *v9fs_fid_iget(struct super_block *sb, struct p9_fid *fid)

6
fs/9p/vfs_inode_dotl.c
View File

@ -78,11 +78,11 @@ struct inode *v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid)
retval = v9fs_init_inode(v9ses, inode, &fid->qid,
st->st_mode, new_decode_dev(st->st_rdev));
v9fs_stat2inode_dotl(st, inode, 0);
kfree(st);
if (retval)
goto error;
v9fs_stat2inode_dotl(st, inode, 0);
v9fs_set_netfs_context(inode);
v9fs_cache_inode_get_cookie(inode);
retval = v9fs_get_acl(inode, fid);
@ -297,7 +297,6 @@ static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
umode_t omode)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
kgid_t gid;
const unsigned char *name;
@ -307,7 +306,6 @@ static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
struct posix_acl *dacl = NULL, *pacl = NULL;
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
v9ses = v9fs_inode2v9ses(dir);
omode |= S_IFDIR;
if (dir->i_mode & S_ISGID)
@ -739,7 +737,6 @@ v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
kgid_t gid;
const unsigned char *name;
umode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
struct inode *inode;
struct p9_qid qid;
@ -749,7 +746,6 @@ v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
dir->i_ino, dentry, omode,
MAJOR(rdev), MINOR(rdev));
v9ses = v9fs_inode2v9ses(dir);
dfid = v9fs_parent_fid(dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);