From 8929fc3a55f33a103adddf9cfd010bcf2b255c7d Mon Sep 17 00:00:00 2001 From: Ziyue Yang Date: Thu, 15 Dec 2016 22:04:53 +0800 Subject: [PATCH] hw/block/pflash_cfi*.c: fix confusing assert fail message The patch is to fix the confusing assert fail message caused by un-initialized device structure (from bite sized tasks). The bug can be reproduced by ./qemu-system-x86_64 -nographic -device cfi.pflash01 The CFI hardware is dynamically loaded by QOM realizing mechanism, however the realizing function in pflash_cfi01_realize function requires the device being initialized manually before calling, like ./qemu-system-x86_64 -nographic -device cfi.pflash01,num-blocks=1024,sector-length=4096,name=testcard Once the initializing parameters are left off in the command, it will leave the device structure not initialized, which makes pflash_cfi01_realize try to realize a zero-volume card, causing /mnt/EXT_volume/projects/qemu/qemu-dev/exec.c:1378: find_ram_offset: Assertion `size != 0\' failed. Through my test, at least the flash device's block-number, sector-length and its name is needed for pflash_cfi01_realize to behave correctly. So I think the new asserts are needed to hint the QEMU user to specify the device's parameters correctly. Signed-off-by: Ziyue Yang Message-Id: <1481810693-13733-1-git-send-email-skiver.cloud.yzy@gmail.com> Signed-off-by: Paolo Bonzini Signed-off-by: Ziyue Yang --- hw/block/pflash_cfi01.c | 13 +++++++++++++ hw/block/pflash_cfi02.c | 13 +++++++++++++ 2 files changed, 26 insertions(+) diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c index 62d7a5661d..5f0ee9db00 100644 --- a/hw/block/pflash_cfi01.c +++ b/hw/block/pflash_cfi01.c @@ -707,6 +707,19 @@ static void pflash_cfi01_realize(DeviceState *dev, Error **errp) int num_devices; Error *local_err = NULL; + if (pfl->sector_len == 0) { + error_setg(errp, "attribute \"sector-length\" not specified or zero."); + return; + } + if (pfl->nb_blocs == 0) { + error_setg(errp, "attribute \"num-blocks\" not specified or zero."); + return; + } + if (pfl->name == NULL) { + error_setg(errp, "attribute \"name\" not specified."); + return; + } + total_len = pfl->sector_len * pfl->nb_blocs; /* These are only used to expose the parameters of each device diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c index 4f6105cc58..ef71322759 100644 --- a/hw/block/pflash_cfi02.c +++ b/hw/block/pflash_cfi02.c @@ -600,6 +600,19 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp) int ret; Error *local_err = NULL; + if (pfl->sector_len == 0) { + error_setg(errp, "attribute \"sector-length\" not specified or zero."); + return; + } + if (pfl->nb_blocs == 0) { + error_setg(errp, "attribute \"num-blocks\" not specified or zero."); + return; + } + if (pfl->name == NULL) { + error_setg(errp, "attribute \"name\" not specified."); + return; + } + chip_len = pfl->sector_len * pfl->nb_blocs; /* XXX: to be fixed */ #if 0 -- 2.39.5