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Subject[PATCH 2.6.13-rc6-mm2] v9fs: readlink extended mode check
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Date
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>

---
commit 4bbf929d3991fde7eeb8754ae10025644637a268
tree bf671c4f29343ef86eb9c00030fa66d06915560b
parent f58a81f47f45c929ea0a1f74f9f15a27d3ad4ded
author Eric Van Hensbergen <ericvh@gmail.com> Tue, 02 Aug 2005 15:40:46
-0500
committer Eric Van Hensbergen <ericvh@gmail.com> Tue, 02 Aug 2005
15:40:46 -0500
fs/9p/vfs_inode.c | 35 ++++++++++++++++++++++++++++++-----
1 files changed, 30 insertions(+), 5 deletions(-)
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -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 *mista
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 supe
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 supe
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
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_
.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,

-
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