* Sergio Gelato [2014-07-25 14:23:03 -0000]:
> Could this be related to the following entry in the changelog
> for 3.2.0-65.98?
>
> * NFSD: Call ->set_acl with a NULL ACL structure if no entries
> - LP: #1328154
Yes, I think that's it. That change allows posix_state_to_acl() to return
NULL in some cases, and the pre-3.14 set_nfsv4_acl() code doesn't guard
against being passed a NULL for the pacl argument. From a brief perusal
of the sources I think this affects kernels 3.13 (trusty) and older.
A quick fix might be to add
if (!pacl)
return vfs_setxattr(dentry, key, NULL, 0, 0);
at the beginning of set_nfsv4_acl_one(). Note I haven't tested this yet.
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https://bugs.launchpad.net/bugs/1348670
Title:
BUG: unable to handle kernel NULL pointer dereference at
0000000000000010, set_nfsv4_acl_one+0x21/0xb0 [nfsd]
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