smartcard: allocate msg with the expected size

Enterprise / Virtualization / SPICE - Marc-André Lureau [redhat.com] - 8 July 2016 03:47 UTC

This is related to CVE-2016-0749

==529== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60040009c098 at pc 0x7fffee0eda6d bp 0x7fffffffcd00 sp 0x7fffffffccf0 WRITE of size 4 at 0x60040009c098 thread T0 #0 0x7fffee0eda6c in smartcard_char_device_notify_reader_add /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:334 #1 0x7fffee0ef783 in smartcard_add_reader /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:642 #2 0x7fffee0f0568 in smartcard_channel_handle_message /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:757 #3 0x7fffee032f3f in red_peer_handle_incoming /home/elmarco/pkg/spice/spice-0.12.4/server/red_channel.c:304 #4 0x7fffee033216 in red_channel_client_receive /home/elmarco/pkg/spice/spice-0.12.4/server/red_channel.c:322 #5 0x7fffee03bf1f in red_channel_client_event /home/elmarco/pkg/spice/spice-0.12.4/server/red_channel.c:1561 #6 0x555555c3c53d in qemu_iohandler_poll /home/elmarco/src/qemu/iohandler.c:143 #7 0x555555c3b800 in main_loop_wait /home/elmarco/src/qemu/main-loop.c:504 #8 0x5555556f160c in main_loop /home/elmarco/src/qemu/vl.c:1818 #9 0x5555556f160c in main /home/elmarco/src/qemu/vl.c:4394 #10 0x7fffed80eb14 in __libc_start_main /usr/src/debug/glibc-2.17-c758a686/csu/libc-start.c:274 #11 0x5555556f9c20 in _start (/home/elmarco/src/qemu/x86_64-softmmu/qemu-system-x86_64+0x1a5c20) 0x60040009c098 is located 0 bytes to the right of 8-byte region [0x60040009c090,0x60040009c098) allocated by thread T0 here: #0 0x7ffff4e612be in __interceptor_realloc /usr/src/debug/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/x86_64-redhat-linux/libsanitizer/asan/../../../../libsanitizer/asan/asan_malloc_linux.cc:92 #1 0x7fffee121308 in spice_realloc /home/elmarco/pkg/spice/spice-0.12.4/spice-common/common/mem.c:123 #2 0x7fffee004a48 in __spice_char_device_write_buffer_get /home/elmarco/pkg/spice/spice-0.12.4/server/char_device.c:516 #3 0x7fffee004e87 in spice_char_device_write_buffer_get /home/elmarco/pkg/spice/spice-0.12.4/server/char_device.c:557 #4 0x7fffee0ed8b9 in smartcard_char_device_notify_reader_add /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:325 #5 0x7fffee0ef783 in smartcard_add_reader /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:642 #6 0x7fffee0f0568 in smartcard_channel_handle_message /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:757 #7 0x7fffee032f3f in red_peer_handle_incoming /home/elmarco/pkg/spice/spice-0.12.4/server/red_channel.c:304 #8 0x7fffee033216 in red_channel_client_receive /home/elmarco/pkg/spice/spice-0.12.4/server/red_channel.c:322 #9 0x7fffee03bf1f in red_channel_client_event /home/elmarco/pkg/spice/spice-0.12.4/server/red_channel.c:1561 #10 0x555555c3c53d in qemu_iohandler_poll /home/elmarco/src/qemu/iohandler.c:143 SUMMARY: AddressSanitizer: heap-buffer-overflow /home/elmarco/pkg/spice/spice-0.12.4/server/smartcard.c:334 smartcard_char_device_notify_reader_add

6b32af3 smartcard: allocate msg with the expected size
server/smartcard.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

Upstream: cgit.freedesktop.org

  • Share