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Date: Mon, 3 Mar 2008 21:54:21 +0300
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Steven Whitehouse <swhiteho@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] GFS2: possible null pointer dereference fixup
gfs2_alloc_get may fail so we have to check it to prevent
NULL pointer dereference.
Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---
bmap.c | 6 +++++-
dir.c | 10 +++++++---
eattr.c | 6 ++++++
inode.c | 7 ++++++-
ops_address.c | 4 ++++
ops_inode.c | 11 ++++++++++-
quota.c | 9 +++++++--
7 files changed, 45 insertions(+), 8 deletions(-)
Index: linux-2.6.git/fs/gfs2/bmap.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/bmap.c 2008-02-06 23:15:16.000000000 +0300
+++ linux-2.6.git/fs/gfs2/bmap.c 2008-03-03 21:45:36.000000000 +0300
@@ -808,6 +808,8 @@ static int do_grow(struct gfs2_inode *ip
int error;
al = gfs2_alloc_get(ip);
+ if (!al)
+ return -ENOMEM;
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
@@ -997,7 +999,9 @@ static int trunc_dealloc(struct gfs2_ino
lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift;
find_metapath(ip, lblock, &mp);
- gfs2_alloc_get(ip);
+
+ if (!gfs2_alloc_get(ip))
+ return -ENOMEM;
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
Index: linux-2.6.git/fs/gfs2/dir.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/dir.c 2008-02-08 19:09:52.000000000 +0300
+++ linux-2.6.git/fs/gfs2/dir.c 2008-03-03 21:22:06.000000000 +0300
@@ -1870,11 +1870,14 @@ static int leaf_dealloc(struct gfs2_inod
if (!ht)
return -ENOMEM;
- gfs2_alloc_get(dip);
+ if (!gfs2_alloc_get(dip)) {
+ error = -ENOMEM;
+ goto out;
+ }
error = gfs2_quota_hold(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
- goto out;
+ goto out_put;
error = gfs2_rindex_hold(sdp, &dip->i_alloc->al_ri_gh);
if (error)
@@ -1952,8 +1955,9 @@ out_rlist:
gfs2_glock_dq_uninit(&dip->i_alloc->al_ri_gh);
out_qs:
gfs2_quota_unhold(dip);
-out:
+out_put:
gfs2_alloc_put(dip);
+out:
kfree(ht);
return error;
}
Index: linux-2.6.git/fs/gfs2/eattr.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/eattr.c 2008-01-26 22:07:50.000000000 +0300
+++ linux-2.6.git/fs/gfs2/eattr.c 2008-03-03 21:02:58.000000000 +0300
@@ -321,6 +321,8 @@ static int ea_remove_unstuffed(struct gf
int error;
al = gfs2_alloc_get(ip);
+ if (!al)
+ return -ENOMEM;
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
@@ -684,6 +686,8 @@ static int ea_alloc_skeleton(struct gfs2
int error;
al = gfs2_alloc_get(ip);
+ if (!al)
+ return -ENOMEM;
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
@@ -1474,6 +1478,8 @@ int gfs2_ea_dealloc(struct gfs2_inode *i
int error;
al = gfs2_alloc_get(ip);
+ if (!al)
+ return -ENOMEM;
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
Index: linux-2.6.git/fs/gfs2/inode.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/inode.c 2008-02-08 19:09:52.000000000 +0300
+++ linux-2.6.git/fs/gfs2/inode.c 2008-03-03 21:24:50.000000000 +0300
@@ -344,6 +344,8 @@ int gfs2_dinode_dealloc(struct gfs2_inod
}
al = gfs2_alloc_get(ip);
+ if (!al)
+ return -ENOMEM;
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
@@ -818,7 +820,8 @@ static int make_dinode(struct gfs2_inode
int error;
munge_mode_uid_gid(dip, &mode, &uid, &gid);
- gfs2_alloc_get(dip);
+ if (!gfs2_alloc_get(dip))
+ return -ENOMEM;
error = gfs2_quota_lock(dip, uid, gid);
if (error)
@@ -853,6 +856,8 @@ static int link_dinode(struct gfs2_inode
int error;
al = gfs2_alloc_get(dip);
+ if (!al)
+ return -ENOMEM;
error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
Index: linux-2.6.git/fs/gfs2/ops_address.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/ops_address.c 2008-02-06 23:15:16.000000000 +0300
+++ linux-2.6.git/fs/gfs2/ops_address.c 2008-03-03 21:34:08.000000000 +0300
@@ -648,6 +648,10 @@ static int gfs2_write_begin(struct file
if (alloc_required) {
al = gfs2_alloc_get(ip);
+ if (!al) {
+ error = -ENOMEM;
+ goto out_unlock;
+ }
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
Index: linux-2.6.git/fs/gfs2/ops_inode.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/ops_inode.c 2008-02-08 19:09:52.000000000 +0300
+++ linux-2.6.git/fs/gfs2/ops_inode.c 2008-03-03 21:49:24.000000000 +0300
@@ -200,6 +200,10 @@ static int gfs2_link(struct dentry *old_
if (alloc_required) {
struct gfs2_alloc *al = gfs2_alloc_get(dip);
+ if (!al) {
+ error = -ENOMEM;
+ goto out_gunlock;
+ }
error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
@@ -716,6 +720,10 @@ static int gfs2_rename(struct inode *odi
if (alloc_required) {
struct gfs2_alloc *al = gfs2_alloc_get(ndip);
+ if (!al) {
+ error = -ENOMEM;
+ goto out_gunlock;
+ }
error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
@@ -953,7 +961,8 @@ static int setattr_chown(struct inode *i
if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
ogid = ngid = NO_QUOTA_CHANGE;
- gfs2_alloc_get(ip);
+ if (!gfs2_alloc_get(ip))
+ return -ENOMEM;
error = gfs2_quota_lock(ip, nuid, ngid);
if (error)
Index: linux-2.6.git/fs/gfs2/quota.c
===================================================================
--- linux-2.6.git.orig/fs/gfs2/quota.c 2008-01-26 22:07:50.000000000 +0300
+++ linux-2.6.git/fs/gfs2/quota.c 2008-03-03 21:33:03.000000000 +0300
@@ -617,8 +617,9 @@ static int gfs2_adjust_quota(struct gfs2
int err = -EIO;
if (gfs2_is_stuffed(ip)) {
- struct gfs2_alloc *al = NULL;
- al = gfs2_alloc_get(ip);
+ struct gfs2_alloc *al = gfs2_alloc_get(ip);
+ if (!al)
+ return -ENOMEM;
/* just request 1 blk */
al->al_requested = 1;
gfs2_inplace_reserve(ip);
@@ -729,6 +730,10 @@ static int do_sync(unsigned int num_qd,
if (nalloc) {
al = gfs2_alloc_get(ip);
+ if (!al) {
+ error = -ENOMEM;
+ goto out_gunlock;
+ }
al->al_requested = nalloc * (data_blocks + ind_blocks);
--
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