https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-4787 Lustre <p>A kernel oops is generated when body-&gt;aclsize != 0 in mdc_unpack_acl, but posix_acl_from_xattr<br/> returns a null pointer. The pointer is checked for error codes, but not for a null value.<br/> The cause of the problem is most likely some data corruption on the MDT side, but the client should tolerate this by sending an error.</p> ZFS based 2.5.1 MGS/MDS/OSS + 2.5.1 or in-kernel client LU-4787

OOPS from null pointer dereference in mdc_unpack_acl

Bug Major Resolved Duplicate WC Triage Roland Fehrenbacher Thu, 20 Mar 2014 12:48:11 +0000 Sat, 1 Nov 2014 09:29:08 +0000 Fri, 31 Oct 2014 23:11:06 +0000 Lustre 2.6.0 Lustre 2.5.1 Lustre 2.4.3 Lustre 2.6.0 0 3 <p>The attached patch fixes the issue and can be applied<br/> to master, b2_5 and b2_4 as well as the in-kernel client.</p> <p>Roland, apologies that we didn't see the patch here. I agree it would have been better to see and land it before more people hit the bug, but at least it was fixed in 2.6, and is scheduled to land for 2.5.4 also.</p> <p>Thanks for bringing the missing patch back to our attention.</p> <p>Andreas, no hard feelings about this here <img class="emoticon" src="https://jira.whamcloud.com/images/icons/emoticons/smile.png" height="16" width="16" align="absmiddle" alt="" border="0"/> Just added <a href="https://jira.whamcloud.com/browse/LU-5840" title="Should Null pointer occurrence in mdc_unpack_acl throw a warning" class="issue-link" data-issue-key="LU-5840"><del>LU-5840</del></a> to discuss the issue<br/> further along the lines mentioned in <a href="https://jira.whamcloud.com/browse/LU-5150" title="NULL pointer dereference in posix_acl_valid() under mdc_get_lustre_md()" class="issue-link" data-issue-key="LU-5150"><del>LU-5150</del></a>.</p> Related LU-5150 Development Rank 1|hzwhw7: Rank (Obsolete) 13166 Severity