Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue() Add proper locking in mmp_pdma_residue() to prevent use-after-free when accessing descriptor list and descriptor contents. The race occurs when multiple threads call tx_status() while the tasklet on another CPU is freeing completed descriptors: CPU 0 CPU 1 ----- ----- mmp_pdma_tx_status() mmp_pdma_residue() -> NO LOCK held list_for_each_entry(sw, ..) DMA interrupt dma_do_tasklet() -> spin_lock(&desc_lock) list_move(sw->node, ...) spin_unlock(&desc_lock) | dma_pool_free(sw) <- FREED! -> access sw->desc <- UAF! This issue can be reproduced when running dmatest on the same channel with multiple threads (threads_per_chan > 1). Fix by protecting the chain_running list iteration and descriptor access with the chan->desc_lock spinlock.
Product status
1b38da264674d6a0fe26a63996b8f88b88c3da48 (git) before 9f665b3c3d9a168410251f27a5d019b7bf93185c
1b38da264674d6a0fe26a63996b8f88b88c3da48 (git) before a143545855bc2c6e1330f6f57ae375ac44af00a7
3.16
Any version before 3.16
6.18.10 (semver)
6.19 (original_commit_for_fix)
References
git.kernel.org/...c/9f665b3c3d9a168410251f27a5d019b7bf93185c
git.kernel.org/...c/a143545855bc2c6e1330f6f57ae375ac44af00a7