ocfs2: fix possible uninitialized variable access

In ocfs2_local_alloc_find_clear_bits and ocfs2_get_dentry, variable
numfound and set may be uninitialized and then used in tracepoint.  In
ocfs2_xattr_block_get and ocfs2_delete_xattr_in_bucket, variable block_off
and xv may be uninitialized and then used in the following logic due to
unchecked return value.

This patch fixes these possible issues.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 2965116..540dc4b 100644 (file)
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -82,7 +82,6 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
        }
 
        status = ocfs2_test_inode_bit(osb, blkno, &set);
-       trace_ocfs2_get_dentry_test_bit(status, set);
        if (status < 0) {
                if (status == -EINVAL) {
                        /*
@@ -96,6 +95,7 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
                goto unlock_nfs_sync;
        }
 
+       trace_ocfs2_get_dentry_test_bit(status, set);
        /* If the inode allocator bit is clear, this inode must be stale */
        if (!set) {
                status = -ESTALE;

diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 096cff6..857bbbc 100644 (file)
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -839,7 +839,7 @@ static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
                                     u32 *numbits,
                                     struct ocfs2_alloc_reservation *resv)
 {
-       int numfound, bitoff, left, startoff, lastzero;
+       int numfound = 0, bitoff, left, startoff, lastzero;
        int local_resv = 0;
        struct ocfs2_alloc_reservation r;
        void *bitmap = NULL;

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 85b190d..4ca7533 100644 (file)
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -1238,6 +1238,10 @@ static int ocfs2_xattr_block_get(struct inode *inode,
                                                                i,
                                                                &block_off,
                                                                &name_offset);
+                       if (ret) {
+                               mlog_errno(ret);
+                               goto cleanup;
+                       }
                        xs->base = bucket_block(xs->bucket, block_off);
                }
                if (ocfs2_xattr_is_local(xs->here)) {
@@ -5665,6 +5669,10 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
 
                ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
                                                      i, &xv, NULL);
+               if (ret) {
+                       mlog_errno(ret);
+                       break;
+               }
 
                ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
                                                         args->ref_ci,