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>

1 files changed, 156 insertions, 0 deletions

diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
new file mode 100644
index 000000000..46d9e9b98
--- /dev/null
+++ b/arch/x86/lib/putuser.S
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * __put_user functions.
+ *
+ * (C) Copyright 2005 Linus Torvalds
+ * (C) Copyright 2005 Andi Kleen
+ * (C) Copyright 2008 Glauber Costa
+ *
+ * These functions have a non-standard call interface
+ * to make them more efficient, especially as they
+ * return an error value in addition to the "real"
+ * return value.
+ */
+#include <linux/export.h>
+#include <linux/linkage.h>
+#include <linux/objtool.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+#include <asm/asm.h>
+#include <asm/smap.h>
+
+/*
+ * __put_user_X
+ *
+ * Inputs:	%eax[:%edx] contains the data
+ *		%ecx contains the address
+ *
+ * Outputs:	%ecx is error code (0 or -EFAULT)
+ *
+ * Clobbers:	%ebx needed for task pointer
+ *
+ * These functions should not modify any other registers,
+ * as they get called from within inline assembly.
+ */
+
+.macro check_range size:req
+.if IS_ENABLED(CONFIG_X86_64)
+	mov %rcx, %rbx
+	sar $63, %rbx
+	or %rbx, %rcx
+.else
+	cmp $TASK_SIZE_MAX-\size+1, %ecx
+	jae .Lbad_put_user
+.endif
+.endm
+
+.text
+SYM_FUNC_START(__put_user_1)
+	ANNOTATE_NOENDBR
+	check_range size=1
+	ASM_STAC
+1:	movb %al,(%_ASM_CX)
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_1)
+EXPORT_SYMBOL(__put_user_1)
+
+SYM_FUNC_START(__put_user_nocheck_1)
+	ANNOTATE_NOENDBR
+	ASM_STAC
+2:	movb %al,(%_ASM_CX)
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_1)
+EXPORT_SYMBOL(__put_user_nocheck_1)
+
+SYM_FUNC_START(__put_user_2)
+	ANNOTATE_NOENDBR
+	check_range size=2
+	ASM_STAC
+3:	movw %ax,(%_ASM_CX)
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_2)
+EXPORT_SYMBOL(__put_user_2)
+
+SYM_FUNC_START(__put_user_nocheck_2)
+	ANNOTATE_NOENDBR
+	ASM_STAC
+4:	movw %ax,(%_ASM_CX)
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_2)
+EXPORT_SYMBOL(__put_user_nocheck_2)
+
+SYM_FUNC_START(__put_user_4)
+	ANNOTATE_NOENDBR
+	check_range size=4
+	ASM_STAC
+5:	movl %eax,(%_ASM_CX)
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_4)
+EXPORT_SYMBOL(__put_user_4)
+
+SYM_FUNC_START(__put_user_nocheck_4)
+	ANNOTATE_NOENDBR
+	ASM_STAC
+6:	movl %eax,(%_ASM_CX)
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_4)
+EXPORT_SYMBOL(__put_user_nocheck_4)
+
+SYM_FUNC_START(__put_user_8)
+	ANNOTATE_NOENDBR
+	check_range size=8
+	ASM_STAC
+7:	mov %_ASM_AX,(%_ASM_CX)
+#ifdef CONFIG_X86_32
+8:	movl %edx,4(%_ASM_CX)
+#endif
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_8)
+EXPORT_SYMBOL(__put_user_8)
+
+SYM_FUNC_START(__put_user_nocheck_8)
+	ANNOTATE_NOENDBR
+	ASM_STAC
+9:	mov %_ASM_AX,(%_ASM_CX)
+#ifdef CONFIG_X86_32
+10:	movl %edx,4(%_ASM_CX)
+#endif
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_8)
+EXPORT_SYMBOL(__put_user_nocheck_8)
+
+SYM_CODE_START_LOCAL(__put_user_handle_exception)
+	ASM_CLAC
+.Lbad_put_user:
+	movl $-EFAULT,%ecx
+	RET
+SYM_CODE_END(__put_user_handle_exception)
+
+	_ASM_EXTABLE_UA(1b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(2b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(3b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(4b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(5b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(6b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(7b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(9b, __put_user_handle_exception)
+#ifdef CONFIG_X86_32
+	_ASM_EXTABLE_UA(8b, __put_user_handle_exception)
+	_ASM_EXTABLE_UA(10b, __put_user_handle_exception)
+#endif