From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- samples/bpf/syscall_nrs.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 samples/bpf/syscall_nrs.c (limited to 'samples/bpf/syscall_nrs.c') diff --git a/samples/bpf/syscall_nrs.c b/samples/bpf/syscall_nrs.c new file mode 100644 index 000000000..a6e600f3d --- /dev/null +++ b/samples/bpf/syscall_nrs.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wmissing-prototypes" + +#define SYSNR(_NR) DEFINE(SYS ## _NR, _NR) + +void syscall_defines(void) +{ + COMMENT("Linux system call numbers."); + SYSNR(__NR_write); + SYSNR(__NR_read); +#ifdef __NR_mmap2 + SYSNR(__NR_mmap2); +#endif +#ifdef __NR_mmap + SYSNR(__NR_mmap); +#endif + +} + +#pragma GCC diagnostic pop -- cgit v1.3.1