The 'Transfer Block Size' field is 12-bit wide. See section '2.2.2. Block Size Register (Offset 004h)' in datasheet.
Two different bug reproducer available: - https://bugs.launchpad.net/qemu/+bug/1892960 - https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fsdhci_oob_write1 Cc: [email protected] Buglink: https://bugs.launchpad.net/qemu/+bug/1892960 Fixes: d7dfca0807a ("hw/sdhci: introduce standard SD host controller") Reported-by: Alexander Bulekov <[email protected]> Signed-off-by: Philippe Mathieu-Daudé <[email protected]> Reviewed-by: Prasad J Pandit <[email protected]> Tested-by: Alexander Bulekov <[email protected]> Message-Id: <[email protected]> --- hw/sd/sdhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c index ed717ab549b..c849c3d99b8 100644 --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -1107,7 +1107,7 @@ sdhci_write(void *opaque, hwaddr offset, uint64_t val, unsigned size) break; case SDHC_BLKSIZE: if (!TRANSFERRING_DATA(s->prnsts)) { - MASKED_WRITE(s->blksize, mask, value); + MASKED_WRITE(s->blksize, mask, extract32(value, 0, 12)); MASKED_WRITE(s->blkcnt, mask >> 16, value >> 16); } -- 2.26.2
