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, 78 insertions, 0 deletions

diff --git a/lib/crypto/fips-aes.h b/lib/crypto/fips-aes.h
new file mode 100644
index 000000000..2a1746606
--- /dev/null
+++ b/lib/crypto/fips-aes.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* This file was generated by: gen-fips-testvecs.py */
+/* clang-format off */
+
+#include <linux/fips.h>
+
+static const u8 fips_test_data[] __initconst __maybe_unused = {
+	0x66, 0x69, 0x70, 0x73, 0x20, 0x74, 0x65, 0x73,
+	0x74, 0x20, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00,
+};
+
+static const u8 fips_test_ad[] __initconst __maybe_unused = {
+	0x66, 0x69, 0x70, 0x73, 0x20, 0x74, 0x65, 0x73,
+	0x74, 0x20, 0x61, 0x64, 0x00, 0x00, 0x00, 0x00,
+};
+
+static const u8 fips_test_iv[] __initconst __maybe_unused = {
+	0x66, 0x69, 0x70, 0x73, 0x20, 0x74, 0x65, 0x73,
+	0x74, 0x20, 0x69, 0x76, 0x00, 0x00, 0x00, 0x00,
+};
+
+static const u8 fips_test_key[] __initconst __maybe_unused = {
+	0x66, 0x69, 0x70, 0x73, 0x20, 0x74, 0x65, 0x73,
+	0x74, 0x20, 0x6b, 0x65, 0x79, 0x00, 0x00, 0x00,
+};
+
+static const u8 fips_test_xts_key[] __initconst __maybe_unused = {
+	0x6b, 0x65, 0x79, 0x31, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x6b, 0x65, 0x79, 0x32, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static const u8 fips_test_aes_cmac_value[] __initconst __maybe_unused = {
+	0xc5, 0x88, 0x28, 0x55, 0xd7, 0x2c, 0x00, 0xb6,
+	0x6a, 0xa7, 0xfc, 0x82, 0x90, 0x81, 0xcf, 0x18,
+};
+
+static const u8 fips_test_aes_ecb_ctext[] __initconst __maybe_unused = {
+	0x47, 0x76, 0x48, 0xaf, 0x1b, 0xd8, 0x4c, 0xe6,
+	0xb5, 0xa7, 0x20, 0x8d, 0x64, 0x88, 0xbc, 0x3f,
+};
+
+static const u8 fips_test_aes_cbc_ctext[] __initconst __maybe_unused = {
+	0xc8, 0x7d, 0x7c, 0x25, 0xba, 0x15, 0xf7, 0xe1,
+	0x08, 0xa0, 0xd0, 0x7a, 0x20, 0x37, 0xaf, 0x5e,
+};
+
+static const u8 fips_test_aes_cbc_cts_ctext[] __initconst __maybe_unused = {
+	0x36, 0x8e, 0x37, 0xb4, 0x78, 0xe2, 0x88, 0x59,
+	0xd5, 0xe8, 0x17, 0x65, 0x5c, 0xa1, 0x25, 0xe6,
+	0xc8, 0x7d, 0x7c, 0x25, 0xba, 0x15, 0xf7, 0xe1,
+	0x08, 0xa0, 0xd0, 0x7a, 0x20, 0x37, 0xaf, 0x5e,
+};
+
+static const u8 fips_test_aes_ctr_ctext[] __initconst __maybe_unused = {
+	0x95, 0xf4, 0xf4, 0x7a, 0xc8, 0xa2, 0x53, 0x73,
+	0x53, 0x8f, 0x95, 0xfc, 0x18, 0xfe, 0x58, 0x2f,
+};
+
+static const u8 fips_test_aes_xts_ctext[] __initconst __maybe_unused = {
+	0xd4, 0x51, 0x7f, 0x01, 0x14, 0x91, 0x16, 0x29,
+	0x26, 0xbe, 0xec, 0x9b, 0x90, 0xed, 0x59, 0x30,
+};
+
+static const u8 fips_test_aes_gcm_ctext_and_tag[] __initconst __maybe_unused = {
+	0x12, 0x0c, 0x5d, 0x03, 0x32, 0x93, 0x13, 0x44,
+	0x06, 0x35, 0x26, 0x9d, 0xe0, 0xea, 0xbc, 0xe2,
+	0x30, 0xa9, 0xa4, 0x15, 0xc5, 0x3d, 0xb3, 0xf9,
+	0x30, 0x82, 0xdf, 0x9c, 0xd8, 0xc4, 0x3f, 0x2f,
+};
+
+static const u8 fips_test_aes_ccm_ctext_and_tag[] __initconst __maybe_unused = {
+	0x11, 0x8e, 0x01, 0xcb, 0xb5, 0x22, 0x6d, 0xb4,
+	0x66, 0x98, 0x97, 0x1d, 0x35, 0x53, 0x78, 0xdd,
+	0xd1, 0xc5, 0xff, 0xb6, 0x90, 0xcf, 0xb1, 0xf2,
+	0x87, 0x99, 0xd6, 0x1e, 0xd5, 0xd1, 0xed, 0x63,
+};