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[PATCH] v9fs: readlink extended mode check

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LANL reported some issues with random crashes during mount of legacy protocol
servers (9P2000 versus 9P2000.u) -- crash was always happening in readlink
(which should never happen in legacy mode).  Added some sanity conditionals to
the get_inode code which should prevent the errors LANL was seeing.  Code
tested benign through regression.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Van Hensbergen 2005-09-09 13:04:27 -07:00 committed by Linus Torvalds
parent 5d58bec5b7
commit b501611a6f
1 changed files with 30 additions and 5 deletions
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35
fs/9p/vfs_inode.c
View file

@ -44,6 +44,7 @@
#include "fid.h"
static struct inode_operations v9fs_dir_inode_operations;
static struct inode_operations v9fs_dir_inode_operations_ext;
static struct inode_operations v9fs_file_inode_operations;
static struct inode_operations v9fs_symlink_inode_operations;
@ -232,6 +233,7 @@ v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
struct inode *v9fs_get_inode(struct super_block *sb, int mode)
{
struct inode *inode = NULL;
struct v9fs_session_info *v9ses = sb->s_fs_info;
dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
@ -250,6 +252,10 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
case S_IFBLK:
case S_IFCHR:
case S_IFSOCK:
if(!v9ses->extended) {
dprintk(DEBUG_ERROR, "special files without extended mode\n");
return ERR_PTR(-EINVAL);
}
init_special_inode(inode, inode->i_mode,
inode->i_rdev);
break;
@ -257,14 +263,21 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
inode->i_op = &v9fs_file_inode_operations;
inode->i_fop = &v9fs_file_operations;
break;
case S_IFLNK:
if(!v9ses->extended) {
dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
return ERR_PTR(-EINVAL);
}
inode->i_op = &v9fs_symlink_inode_operations;
break;
case S_IFDIR:
inode->i_nlink++;
inode->i_op = &v9fs_dir_inode_operations;
if(v9ses->extended)
inode->i_op = &v9fs_dir_inode_operations_ext;
else
inode->i_op = &v9fs_dir_inode_operations;
inode->i_fop = &v9fs_dir_operations;
break;
case S_IFLNK:
inode->i_op = &v9fs_symlink_inode_operations;
break;
default:
dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
mode, mode & S_IFMT);
@ -1284,7 +1297,7 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
return retval;
}
static struct inode_operations v9fs_dir_inode_operations = {
static struct inode_operations v9fs_dir_inode_operations_ext = {
.create = v9fs_vfs_create,
.lookup = v9fs_vfs_lookup,
.symlink = v9fs_vfs_symlink,
@ -1299,6 +1312,18 @@ static struct inode_operations v9fs_dir_inode_operations = {
.setattr = v9fs_vfs_setattr,
};
static struct inode_operations v9fs_dir_inode_operations = {
.create = v9fs_vfs_create,
.lookup = v9fs_vfs_lookup,
.unlink = v9fs_vfs_unlink,
.mkdir = v9fs_vfs_mkdir,
.rmdir = v9fs_vfs_rmdir,
.mknod = v9fs_vfs_mknod,
.rename = v9fs_vfs_rename,
.getattr = v9fs_vfs_getattr,
.setattr = v9fs_vfs_setattr,
};
static struct inode_operations v9fs_file_inode_operations = {
.getattr = v9fs_vfs_getattr,
.setattr = v9fs_vfs_setattr,