AZL-89048

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: bla: prevent use-after-free when deleting claims

When batadvbladelbackboneclaims() removes all claims for a backbone, it does this by dropping the link entry in the hash list. This list entry itself was one of the references which need to be dropped at the same time via batadvclaimput().

But the batadvclaimput() must not be done before the last access to the claim object in this function. Otherwise the claim might be freed already by the batadvclaimrelease() function before the list entry was dropped.