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| author | Abhi Das <adas@redhat.com> | 2014-03-31 10:33:17 -0500 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2014-03-31 16:41:39 +0100 |
| commit | 059788039f1e6343f34f46d202f8d9f2158c2783 (patch) | |
| tree | f122d85bf11e42c4b1babb1b720df747386ba95d /fs/gfs2 | |
| parent | e9fb7c73a43e0551e689b7024f1581af5fa36a03 (diff) | |
| download | lwn-059788039f1e6343f34f46d202f8d9f2158c2783.tar.gz lwn-059788039f1e6343f34f46d202f8d9f2158c2783.zip | |
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>
Diffstat (limited to 'fs/gfs2')
| -rw-r--r-- | fs/gfs2/incore.h | 1 | ||||
| -rw-r--r-- | fs/gfs2/inode.c | 11 | ||||
| -rw-r--r-- | fs/gfs2/super.c | 7 |
3 files changed, 13 insertions, 6 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index ef26ed98e778..bdf70c18610c 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -371,6 +371,7 @@ enum { GIF_ALLOC_FAILED = 2, GIF_SW_PAGED = 3, GIF_ORDERED = 4, + GIF_FREE_VFS_INODE = 5, }; struct gfs2_inode { diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 69ed57a980d0..28cc7bf6575a 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -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: diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index a08c66e270bf..29cacd57516a 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -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; |