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Backport of:
From 5cd7aa3451b76bb19c0f6adc2b931f091e5d7fcd Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Wed, 3 Mar 2021 20:26:38 +0800
Subject: [PATCH] hw/sd: sdhci: Limit block size only when SDHC_BLKSIZE
register is writable
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit
The codes to limit the maximum block size is only necessary when
SDHC_BLKSIZE register is writable.
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Message-Id: <20210303122639.20004-5-bmeng.cn@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
CVE: CVE-2021-3409 CVE-2020-17380
Upstream-Status: Backport [import from ubuntu https://git.launchpad.net/ubuntu/+source/qemu/tree/debian/patches/CVE-2021-3409-4.patch?h=ubuntu/focal-security Upstream commit https://github.com/qemu/qemu/commit/5cd7aa3451b76bb19c0f6adc2b931f091e5d7fcd ]
Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
---
hw/sd/sdhci.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1137,15 +1137,15 @@ sdhci_write(void *opaque, hwaddr offset,
if (!TRANSFERRING_DATA(s->prnsts)) {
MASKED_WRITE(s->blksize, mask, extract32(value, 0, 12));
MASKED_WRITE(s->blkcnt, mask >> 16, value >> 16);
- }
- /* Limit block size to the maximum buffer size */
- if (extract32(s->blksize, 0, 12) > s->buf_maxsz) {
- qemu_log_mask(LOG_GUEST_ERROR, "%s: Size 0x%x is larger than " \
- "the maximum buffer 0x%x", __func__, s->blksize,
- s->buf_maxsz);
+ /* Limit block size to the maximum buffer size */
+ if (extract32(s->blksize, 0, 12) > s->buf_maxsz) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Size 0x%x is larger than "
+ "the maximum buffer 0x%x\n", __func__, s->blksize,
+ s->buf_maxsz);
- s->blksize = deposit32(s->blksize, 0, 12, s->buf_maxsz);
+ s->blksize = deposit32(s->blksize, 0, 12, s->buf_maxsz);
+ }
}
break;
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