Segfault in artist.c:block_move

[Alexander Bulekov]

Hello,
Reproducer:

cat << EOF | ./hppa-softmmu/qemu-system-hppa -m 64 -display none \
-qtest stdio -accel qtest
writeq 0xf8100802 0xff5c651ffffb7c5c
writeq 0xf8100afb 0x25e000000000000
EOF

AddressSanitizer:DEADLYSIGNAL
=================================================================
==12686==ERROR: AddressSanitizer: SEGV on unknown address 0x7f001a540000 (pc 0x55af3a373078 bp 0x7ffc23001a00 sp 0x7ffc23001670 T0)
==12686==The signal is caused by a READ memory access.
    #0 0x55af3a373078 in block_move /hw/display/artist.c:525:13
    #1 0x55af3a365fbc in artist_reg_write /hw/display/artist.c:964:9
    #2 0x55af39a577a3 in memory_region_write_accessor /softmmu/memory.c:483:5
    #3 0x55af39a56adc in access_with_adjusted_size /softmmu/memory.c:539:18
    #4 0x55af39a54873 in memory_region_dispatch_write /softmmu/memory.c:1466:16
    #5 0x55af39102056 in flatview_write_continue /exec.c:3176:23
    #6 0x55af390ea866 in flatview_write /exec.c:3216:14
    #7 0x55af390ea387 in address_space_write /exec.c:3308:18
    #8 0x55af39afe604 in qtest_process_command /softmmu/qtest.c:452:13
    #9 0x55af39af5c08 in qtest_process_inbuf /softmmu/qtest.c:710:9
    #10 0x55af39af4895 in qtest_read /softmmu/qtest.c:722:5
    #11 0x55af3bfb0c43 in qemu_chr_be_write_impl /chardev/char.c:188:9
    #12 0x55af3bfb0dc7 in qemu_chr_be_write /chardev/char.c:200:9
    #13 0x55af3bfc50b3 in fd_chr_read /chardev/char-fd.c:68:9
    #14 0x55af3c119474 in qio_channel_fd_source_dispatch /io/channel-watch.c:84:12
    #15 0x7f0028f60897 in g_main_context_dispatch (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4e897)
    #16 0x55af3c51137b in glib_pollfds_poll /util/main-loop.c:217:9
    #17 0x55af3c50eaab in os_host_main_loop_wait /util/main-loop.c:240:5
    #18 0x55af3c50e444 in main_loop_wait /util/main-loop.c:516:11
    #19 0x55af39b16d00 in qemu_main_loop /softmmu/vl.c:1676:9
    #20 0x55af3c151261 in main /softmmu/main.c:49:5
    #21 0x7f0027ae6e0a in __libc_start_main /build/glibc-GwnBeO/glibc-2.30/csu/../csu/libc-start.c:308:16
    #22 0x55af38ff5729 in _start (/home/alxndr/Development/qemu/general-fuzz/build/hppa-softmmu/qemu-system-hppa+0x22d4729)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /hw/display/artist.c:525:13 in block_move
==12686==ABORTING

The error occurs even with Message-Id: <email address hidden> applied (I collected the above trace with the patch-set applied)

Thanks
-Alex

[Philippe Mathieu-Daudé (philmd)]

Fixed by commit a501bfc91763d4642390090dd4e6039d67b63702.

[Thomas Huth (th-huth)]

Released with QEMU v5.2.0.