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 --- include/asm-generic/audit_read.h | 51 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 include/asm-generic/audit_read.h (limited to 'include/asm-generic/audit_read.h') diff --git a/include/asm-generic/audit_read.h b/include/asm-generic/audit_read.h new file mode 100644 index 000000000..d8dc3dd6b --- /dev/null +++ b/include/asm-generic/audit_read.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifdef __NR_readlink +__NR_readlink, +#endif +__NR_quotactl, +#ifdef __NR_quotactl_fd +__NR_quotactl_fd, +#endif +__NR_listxattr, +#ifdef __NR_listxattrat +__NR_listxattrat, +#endif +__NR_llistxattr, +__NR_flistxattr, +__NR_getxattr, +#ifdef __NR_getxattrat +__NR_getxattrat, +#endif +__NR_lgetxattr, +__NR_fgetxattr, +#ifdef __NR_readlinkat +__NR_readlinkat, +#endif +#ifdef __NR_file_getattr +__NR_file_getattr, +#endif +#ifdef __NR_stat +__NR_stat, +#endif +#ifdef __NR_stat64 +__NR_stat64, +#endif +#ifdef __NR_lstat +__NR_lstat, +#endif +#ifdef __NR_lstat64 +__NR_lstat64, +#endif +#ifdef __NR_fstat +__NR_fstat, +#endif +#ifdef __NR_fstat64 +__NR_fstat64, +#endif +#ifdef __NR_newfstatat +__NR_newfstatat, +#endif +#ifdef __NR_fstatat64 +__NR_fstatat64, +#endif +__NR_statx, -- cgit v1.3.1