Description

In the Linux kernel, the following vulnerability has been resolved: jfs: fix uninitialized waitqueue in transaction manager The transaction manager initialization in txInit() was not properly initializing TxBlock[0].waitor waitqueue, causing a crash when txEnd(0) is called on read-only filesystems. When a filesystem is mounted read-only, txBegin() returns tid=0 to indicate no transaction. However, txEnd(0) still gets called and tries to access TxBlock[0].waitor via tid_to_tblock(0), but this waitqueue was never initialized because the initialization loop started at index 1 instead of 0. This causes a 'non-static key' lockdep warning and system crash: INFO: trying to register non-static key in txEnd Fix by ensuring all transaction blocks including TxBlock[0] have their waitqueues properly initialized during txInit().

References 8

• git.kernel.org https://git.kernel.org/stable/c/038861414ab383b41dd35abbf9ff0ef715592d53
• git.kernel.org https://git.kernel.org/stable/c/2a9575a372182ca075070b3cd77490dcf0c951e7
• git.kernel.org https://git.kernel.org/stable/c/300b072df72694ea330c4c673c035253e07827b8
• git.kernel.org https://git.kernel.org/stable/c/8cae9cf23e0bd424ac904e753639a587543ce03a
• git.kernel.org https://git.kernel.org/stable/c/a2aa97cde9857f881920635a2e3d3b11769619c5
• git.kernel.org https://git.kernel.org/stable/c/cbf2f527ae4ca7c7dabce42e85e8deb58588a37e
• git.kernel.org https://git.kernel.org/stable/c/d2dd7ca05a11685c314e62802a55e8d67a90e974
• git.kernel.org https://git.kernel.org/stable/c/d6af7fce2e162ac68e85d3a11eb6ac8c35b24b64

Remediation