OSS-Fuzz found sending illegal addresses when querying the write
protection bits triggers an assertion:
qemu-fuzz-i386: hw/sd/sd.c:824: uint32_t sd_wpbits(SDState *, uint64_t): Assertion `wpnum < sd->wpgrps_size' failed.
==11578== ERROR: libFuzzer: deadly signal
#8 0x7ffff628e091 in __assert_fail
#9 0x5555588f1a3c in sd_wpbits hw/sd/sd.c:824:9
#10 0x5555588dd271 in sd_normal_command hw/sd/sd.c:1383:38
#11 0x5555588d777c in sd_do_command hw/sd/sd.c
#12 0x555558cb25a0 in sdbus_do_command hw/sd/core.c💯16
#13 0x555558e02a9a in sdhci_send_command hw/sd/sdhci.c:337:12
#14 0x555558dffa46 in sdhci_write hw/sd/sdhci.c:1187:9
#15 0x5555598b9d76 in memory_region_write_accessor softmmu/memory.c:489:5
Similarly to commit 8573378e62 ("hw/sd: fix out-of-bounds check
for multi block reads"), check the address range before sending
the status of the write protection bits.
Include the qtest reproducer provided by Alexander Bulekov:
$ make check-qtest-i386
...
Running test qtest-i386/fuzz-sdcard-test
qemu-system-i386: ../hw/sd/sd.c:824: sd_wpbits: Assertion `wpnum < sd->wpgrps_size' failed.
Reported-by: OSS-Fuzz (Issue 29225)
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/450
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20210702155900.148665-4-f4bug@amsat.org>
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