__jfs_set_acl() does not check for acl being NULL
In my case, the kernel null pointer dereference occurs when exporting jfs over nfs3. Accessing the nfs causes a crash of the nfsd and corrupted files, probably as a clean
unmount is not possible.
--- linux-3.14.2_vanilla/fs/jfs/acl.c 2014-04-28 17:24:55.544597204 +0200
+++ linux-3.14.2_patched/fs/jfs/acl.c 2014-04-29 19:44:13.589311607 +0200
@@ -83,13 +83,15 @@
switch (type) {
case ACL_TYPE_ACCESS:
ea_name = POSIX_ACL_XATTR_ACCESS;
- rc = posix_acl_equiv_mode(acl, &inode->i_mode);
- if (rc < 0)
- return rc;
- inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(inode);
- if (rc == 0)
- acl = NULL;
+ if( acl ) {
+ rc = posix_acl_equiv_mode(acl, &inode->i_mode);
+ if (rc < 0)
+ return rc;
+ inode->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(inode);
+ if (rc == 0)
+ acl = NULL;
+ }
break;
case ACL_TYPE_DEFAULT:
ea_name = POSIX_ACL_XATTR_DEFAULT;
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
