At the end of sdhci_send_command(), it starts a data transfer if the command register indicates a data is associated. However the data transfer should only be initiated when the command execution has succeeded.
Cc: qemu-sta...@nongnu.org Fixes: CVE-2020-17380 Fixes: CVE-2020-25085 Reported-by: Alexander Bulekov <alx...@bu.edu> Reported-by: Sergej Schumilo (Ruhr-University Bochum) Reported-by: Cornelius Aschermann (Ruhr-University Bochum) Reported-by: Simon Wrner (Ruhr-University Bochum) Buglink: https://bugs.launchpad.net/qemu/+bug/1892960 Signed-off-by: Bin Meng <bmeng...@gmail.com> --- hw/sd/sdhci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c index 8ffa539..0450110 100644 --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -326,6 +326,7 @@ static void sdhci_send_command(SDHCIState *s) SDRequest request; uint8_t response[16]; int rlen; + bool cmd_failure = false; s->errintsts = 0; s->acmd12errsts = 0; @@ -349,6 +350,7 @@ static void sdhci_send_command(SDHCIState *s) trace_sdhci_response16(s->rspreg[3], s->rspreg[2], s->rspreg[1], s->rspreg[0]); } else { + cmd_failure = true; trace_sdhci_error("timeout waiting for command response"); if (s->errintstsen & SDHC_EISEN_CMDTIMEOUT) { s->errintsts |= SDHC_EIS_CMDTIMEOUT; @@ -369,7 +371,7 @@ static void sdhci_send_command(SDHCIState *s) sdhci_update_irq(s); - if (s->blksize && (s->cmdreg & SDHC_CMD_DATA_PRESENT)) { + if (!cmd_failure && s->blksize && (s->cmdreg & SDHC_CMD_DATA_PRESENT)) { s->data_count = 0; sdhci_data_transfer(s); } -- 2.7.4