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Subject[PATCH 4.14 145/267] crypto: ccp - fix uninitialized list head
Date
From: Mark Salter <msalter@redhat.com>

commit 691505a803a7f223b2af621848d581259c61f77d upstream.

A NULL-pointer dereference was reported in fedora bz#1762199 while
reshaping a raid6 array after adding a fifth drive to an existing
array.

[ 47.343549] md/raid:md0: raid level 6 active with 3 out of 5 devices, algorithm 2
[ 47.804017] md0: detected capacity change from 0 to 7885289422848
[ 47.822083] Unable to handle kernel read from unreadable memory at virtual address 0000000000000000
...
[ 47.940477] CPU: 1 PID: 14210 Comm: md0_raid6 Tainted: G W 5.2.18-200.fc30.aarch64 #1
[ 47.949594] Hardware name: AMD Overdrive/Supercharger/To be filled by O.E.M., BIOS ROD1002C 04/08/2016
[ 47.958886] pstate: 00400085 (nzcv daIf +PAN -UAO)
[ 47.963668] pc : __list_del_entry_valid+0x2c/0xa8
[ 47.968366] lr : ccp_tx_submit+0x84/0x168 [ccp]
[ 47.972882] sp : ffff00001369b970
[ 47.976184] x29: ffff00001369b970 x28: ffff00001369bdb8
[ 47.981483] x27: 00000000ffffffff x26: ffff8003b758af70
[ 47.986782] x25: ffff8003b758b2d8 x24: ffff8003e6245818
[ 47.992080] x23: 0000000000000000 x22: ffff8003e62450c0
[ 47.997379] x21: ffff8003dfd6add8 x20: 0000000000000003
[ 48.002678] x19: ffff8003e6245100 x18: 0000000000000000
[ 48.007976] x17: 0000000000000000 x16: 0000000000000000
[ 48.013274] x15: 0000000000000000 x14: 0000000000000000
[ 48.018572] x13: ffff7e000ef83a00 x12: 0000000000000001
[ 48.023870] x11: ffff000010eff998 x10: 00000000000019a0
[ 48.029169] x9 : 0000000000000000 x8 : ffff8003e6245180
[ 48.034467] x7 : 0000000000000000 x6 : 000000000000003f
[ 48.039766] x5 : 0000000000000040 x4 : ffff8003e0145080
[ 48.045064] x3 : dead000000000200 x2 : 0000000000000000
[ 48.050362] x1 : 0000000000000000 x0 : ffff8003e62450c0
[ 48.055660] Call trace:
[ 48.058095] __list_del_entry_valid+0x2c/0xa8
[ 48.062442] ccp_tx_submit+0x84/0x168 [ccp]
[ 48.066615] async_tx_submit+0x224/0x368 [async_tx]
[ 48.071480] async_trigger_callback+0x68/0xfc [async_tx]
[ 48.076784] ops_run_biofill+0x178/0x1e8 [raid456]
[ 48.081566] raid_run_ops+0x248/0x818 [raid456]
[ 48.086086] handle_stripe+0x864/0x1208 [raid456]
[ 48.090781] handle_active_stripes.isra.0+0xb0/0x278 [raid456]
[ 48.096604] raid5d+0x378/0x618 [raid456]
[ 48.100602] md_thread+0xa0/0x150
[ 48.103905] kthread+0x104/0x130
[ 48.107122] ret_from_fork+0x10/0x18
[ 48.110686] Code: d2804003 f2fbd5a3 eb03003f 54000320 (f9400021)
[ 48.116766] ---[ end trace 23f390a527f7ad77 ]---

ccp_tx_submit is passed a dma_async_tx_descriptor which is contained in
a ccp_dma_desc and adds it to a ccp channel's pending list:

list_del(&desc->entry);
list_add_tail(&desc->entry, &chan->pending);

The problem is that desc->entry may be uninitialized in the
async_trigger_callback path where the descriptor was gotten
from ccp_prep_dma_interrupt which got it from ccp_alloc_dma_desc
which doesn't initialize the desc->entry list head. So, just
initialize the list head to avoid the problem.

Cc: <stable@vger.kernel.org>
Reported-by: Sahaj Sarup <sahajsarup@gmail.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/crypto/ccp/ccp-dmaengine.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/crypto/ccp/ccp-dmaengine.c
+++ b/drivers/crypto/ccp/ccp-dmaengine.c
@@ -341,6 +341,7 @@ static struct ccp_dma_desc *ccp_alloc_dm
desc->tx_desc.flags = flags;
desc->tx_desc.tx_submit = ccp_tx_submit;
desc->ccp = chan->ccp;
+ INIT_LIST_HEAD(&desc->entry);
INIT_LIST_HEAD(&desc->pending);
INIT_LIST_HEAD(&desc->active);
desc->status = DMA_IN_PROGRESS;

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