From: Li RongQing <lirongqing@baidu.com> stable inclusion from stable-v6.6.36 commit faa35db78b058a2ab6e074ee283f69fa398c36a8 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACZX7 CVE: CVE-2024-40956 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit e3215deca4520773cd2b155bed164c12365149a7 ] Use list_for_each_entry_safe() to allow iterating through the list and deleting the entry in the iteration process. The descriptor is freed via idxd_desc_complete() and there's a slight chance may cause issue for the list iterator when the descriptor is reused by another thread without it being deleted from the list. Fixes: 16e19e11228b ("dmaengine: idxd: Fix list corruption in description completion") Signed-off-by: Li RongQing <lirongqing@baidu.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Fenghua Yu <fenghua.yu@intel.com> Link: https://lore.kernel.org/r/20240603012444.11902-1-lirongqing@baidu.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Liu Shixin <liushixin2@huawei.com> --- drivers/dma/idxd/irq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c index aa314ebec587..4a3eb96b8199 100644 --- a/drivers/dma/idxd/irq.c +++ b/drivers/dma/idxd/irq.c @@ -454,11 +454,13 @@ static void irq_process_work_list(struct idxd_irq_entry *irq_entry) spin_unlock(&irq_entry->list_lock); - list_for_each_entry(desc, &flist, list) { + list_for_each_entry_safe(desc, n, &flist, list) { /* * Check against the original status as ABORT is software defined * and 0xff, which DSA_COMP_STATUS_MASK can mask out. */ + list_del(&desc->list); + if (unlikely(desc->completion->status == IDXD_COMP_DESC_ABORT)) { idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT, true); continue; -- 2.25.1