File 0199-sd-sdhci-check-transfer-mode-regist.patch of Package qemu-linux-user.7436

Overview Repositories Revisions Requests Users Attributes Meta

File 0199-sd-sdhci-check-transfer-mode-regist.patch of Package qemu-linux-user.7436

From d9f44f6ed63ea9c5778d08ed0dc53b937dba903b Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Tue, 28 Feb 2017 12:08:14 +0000
Subject: [PATCH] sd: sdhci: check transfer mode register in multi block
 transfer

In the SDHCI protocol, the transfer mode register value
is used during multi block transfer to check if block count
register is enabled and should be updated. Transfer mode
register could be set such that, block count register would
not be updated, thus leading to an infinite loop. Add check
to avoid it.

Reported-by: Wjjzhang <wjjzhang@tencent.com>
Reported-by: Jiang Xin <jiangxin1@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 20170214185225.7994-3-ppandit@redhat.com
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 6e86d90352adf6cb08295255220295cf23c4286e)
[BR: BSC#1025311 CVE-2017-5987]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/sd/sdhci.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index f4cf5c7c50..fedc786a50 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -485,6 +485,11 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
     uint32_t boundary_chk = 1 << (((s->blksize & 0xf000) >> 12) + 12);
     uint32_t boundary_count = boundary_chk - (s->sdmasysad % boundary_chk);
 
+    if (!(s->trnmod & SDHC_TRNS_BLK_CNT_EN) || !s->blkcnt) {
+        qemu_log_mask(LOG_UNIMP, "infinite transfer is not supported\n");
+        return;
+    }
+
     /* XXX: Some sd/mmc drivers (for example, u-boot-slp) do not account for
      * possible stop at page boundary if initial address is not page aligned,
      * allow them to work properly */
@@ -796,11 +801,6 @@ static void sdhci_data_transfer(void *opaque)
     if (s->trnmod & SDHC_TRNS_DMA) {
         switch (SDHC_DMA_TYPE(s->hostctl)) {
         case SDHC_CTRL_SDMA:
-            if ((s->trnmod & SDHC_TRNS_MULTI) &&
-                    (!(s->trnmod & SDHC_TRNS_BLK_CNT_EN) || s->blkcnt == 0)) {
-                break;
-            }
-
             if ((s->blkcnt == 1) || !(s->trnmod & SDHC_TRNS_MULTI)) {
                 sdhci_sdma_transfer_single_block(s);
             } else {

Places

File 0199-sd-sdhci-check-transfer-mode-regist.patch of Package qemu-linux-user.7436

Places