From 0719e71e5297f68b6b4500aa74e1b49d59806342 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Fri, 4 Mar 2016 11:30:17 +0000 Subject: [PATCH] sd.c: Handle NULL block backend in sd_get_inserted() The sd.c SD card emulation code can be in a state where the SDState BlockBackend pointer is NULL; this is treated as "card not present". Add a missing check to sd_get_inserted() so that we don't segfault in this situation. (This could be provoked by the guest writing to the SDHCI register to do a reset on a xilinx-zynq-a9 board; it will also happen at startup when sdhci implements its DeviceClass reset method.) Signed-off-by: Peter Maydell Reviewed-by: Alistair Francis Message-id: 1456493044-10025-2-git-send-email-peter.maydell@linaro.org --- hw/sd/sd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/sd/sd.c b/hw/sd/sd.c index edb6b32690..00c320d00b 100644 --- a/hw/sd/sd.c +++ b/hw/sd/sd.c @@ -449,7 +449,7 @@ static void sd_reset(DeviceState *dev) static bool sd_get_inserted(SDState *sd) { - return blk_is_inserted(sd->blk); + return sd->blk && blk_is_inserted(sd->blk); } static bool sd_get_readonly(SDState *sd)