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GFS2: Fix uninitialized VFS inode in gfs2_create_inode 

When gfs2_create_inode() fails due to quota violation, the VFS
inode is not completely uninitialized. This can cause a list
corruption error.

This patch correctly uninitializes the VFS inode when a quota
violation occurs in the gfs2_create_inode codepath.

Resolves: rhbz#1059808
Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Abhi Das 2014-03-31 10:33:17 -05:00 committed by Steven Whitehouse
parent e9fb7c73a4
commit 059788039f
3 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/gfs2/incore.h
View File

@ -371,6 +371,7 @@ enum {
GIF_ALLOC_FAILED = 2,
GIF_SW_PAGED = 3,
GIF_ORDERED = 4,
GIF_FREE_VFS_INODE = 5,
};
struct gfs2_inode {

11
fs/gfs2/inode.c
View File

@ -597,7 +597,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_glock *io_gl;
struct dentry *d;
int error;
int error, free_vfs_inode = 0;
u32 aflags = 0;
unsigned blocks = 1;
struct gfs2_diradd da = { .bh = NULL, };
@ -788,15 +788,16 @@ fail_free_acls:
if (acl)
posix_acl_release(acl);
fail_free_vfs_inode:
free_inode_nonrcu(inode);
inode = NULL;
free_vfs_inode = 1;
fail_gunlock:
gfs2_dir_no_add(&da);
gfs2_glock_dq_uninit(ghs);
if (inode && !IS_ERR(inode)) {
clear_nlink(inode);
mark_inode_dirty(inode);
set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
if (!free_vfs_inode)
mark_inode_dirty(inode);
set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
&GFS2_I(inode)->i_flags);
iput(inode);
}
fail:

7
fs/gfs2/super.c
View File

@ -1248,7 +1248,7 @@ static int gfs2_drop_inode(struct inode *inode)
{
struct gfs2_inode *ip = GFS2_I(inode);
if (inode->i_nlink) {
if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
clear_nlink(inode);
@ -1463,6 +1463,11 @@ static void gfs2_evict_inode(struct inode *inode)
struct gfs2_holder gh;
int error;
if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
clear_inode(inode);
return;
}
if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
goto out;