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sd.c: Handle NULL block backend in sd_get_inserted()

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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 <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Message-id: 1456493044-10025-2-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2016-03-04 11:30:17 +00:00
parent 71c2768433
commit 0719e71e52
1 changed files with 1 additions and 1 deletions
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2
hw/sd/sd.c
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@ -449,7 +449,7 @@ static void sd_reset(DeviceState *dev)
static bool sd_get_inserted(SDState *sd) 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) static bool sd_get_readonly(SDState *sd)