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, 46 insertions, 0 deletions

diff --git a/lib/crypto/fips-sha.h b/lib/crypto/fips-sha.h
new file mode 100644
index 000000000..68af7e14e
--- /dev/null
+++ b/lib/crypto/fips-sha.h
@@ -0,0 +1,46 @@
+/* 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_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_hmac_sha1_value[] __initconst __maybe_unused = {
+	0x29, 0xa9, 0x88, 0xb8, 0x5c, 0xb4, 0xaf, 0x4b,
+	0x97, 0x2a, 0xee, 0x87, 0x5b, 0x0a, 0x02, 0x55,
+	0x99, 0xbf, 0x86, 0x78,
+};
+
+static const u8 fips_test_hmac_sha256_value[] __initconst __maybe_unused = {
+	0x59, 0x25, 0x85, 0xcc, 0x40, 0xe9, 0x64, 0x2f,
+	0xe9, 0xbf, 0x82, 0xb7, 0xd3, 0x15, 0x3d, 0x43,
+	0x22, 0x0b, 0x4c, 0x00, 0x90, 0x14, 0x25, 0xcf,
+	0x9e, 0x13, 0x2b, 0xc2, 0x30, 0xe6, 0xe8, 0x93,
+};
+
+static const u8 fips_test_hmac_sha512_value[] __initconst __maybe_unused = {
+	0x6b, 0xea, 0x5d, 0x27, 0x49, 0x5b, 0x3f, 0xea,
+	0xde, 0x2d, 0xfa, 0x32, 0x75, 0xdb, 0x77, 0xc8,
+	0x26, 0xe9, 0x4e, 0x95, 0x4d, 0xad, 0x88, 0x02,
+	0x87, 0xf9, 0x52, 0x0a, 0xd1, 0x92, 0x80, 0x1d,
+	0x92, 0x7e, 0x3c, 0xbd, 0xb1, 0x3c, 0x49, 0x98,
+	0x44, 0x9c, 0x8f, 0xee, 0x3f, 0x02, 0x71, 0x51,
+	0x57, 0x0b, 0x15, 0x38, 0x95, 0xd8, 0xa3, 0x81,
+	0xba, 0xb3, 0x15, 0x37, 0x5c, 0x6d, 0x57, 0x2b,
+};
+
+static const u8 fips_test_sha3_256_value[] __initconst __maybe_unused = {
+	0x77, 0xc4, 0x8b, 0x69, 0x70, 0x5f, 0x0a, 0xb1,
+	0xb1, 0xa5, 0x82, 0x0a, 0x22, 0x2b, 0x49, 0x31,
+	0xba, 0x9b, 0xb6, 0xaa, 0x32, 0xa7, 0x97, 0x00,
+	0x98, 0xdb, 0xff, 0xe7, 0xc6, 0xde, 0xb5, 0x82,
+};