diff options
| author | Shivank Garg <shivankg@amd.com> | 2026-08-22 19:22:05 +0000 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2026-09-09 17:51:44 +0530 |
| commit | e873c74132f0c5f1452816cd9bb26208f0bba1e1 (patch) | |
| tree | cc1ce1567f5b982359331863ebd9da38741f8d2e /arch/x86/boot/cpuflags.h | |
| download | linux-stable-e873c74132f0c5f1452816cd9bb26208f0bba1e1.tar.gz linux-stable-e873c74132f0c5f1452816cd9bb26208f0bba1e1.zip | |
dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()grafted
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 <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Shivank Garg <shivankg@amd.com>
Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'arch/x86/boot/cpuflags.h')
| -rw-r--r-- | arch/x86/boot/cpuflags.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/boot/cpuflags.h b/arch/x86/boot/cpuflags.h new file mode 100644 index 000000000..a398d9204 --- /dev/null +++ b/arch/x86/boot/cpuflags.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef BOOT_CPUFLAGS_H +#define BOOT_CPUFLAGS_H + +#include <asm/cpufeatures.h> +#include <asm/processor-flags.h> + +struct cpu_features { + int level; /* Family, or 64 for x86-64 */ + int family; /* Family, always */ + int model; + u32 flags[NCAPINTS]; +}; + +extern struct cpu_features cpu; +extern u32 cpu_vendor[3]; + +#ifdef CONFIG_X86_32 +bool has_eflag(unsigned long mask); +#else +static inline bool has_eflag(unsigned long mask) { return true; } +#endif +void get_cpuflags(void); +void cpuid_count(u32 id, u32 count, u32 *a, u32 *b, u32 *c, u32 *d); +bool has_cpuflag(int flag); + +#endif |