cursor:heap-use-after-free in cursor_put functions · Pull Request !1663 · openEuler/qemu

**1. cursor:heap-use-after-free in cursor_put functions
Spice 线程会访问 cursor模块，相关内存可能被主线 vnc_dpy_cursor_define 释放
vnc_dpy_cursor_define和qxl_spice_reset_cursor函数没有加锁**

==18386==ERROR: AddressSanitizer: heap-use-after-free on address 0x6290016a820c at pc 0x55811982f041 bp 0x7ffc82368100 sp 0x7ffc823680e0
READ of size 4 at 0x6290016a820c thread T0
    #0 0x55811982f040 in cursor_put ui/cursor.c:118
    #1 0x5581198508dc in vnc_dpy_cursor_define ui/vnc.c:976
    #2 0x5581198267ac in dpy_cursor_define ui/console.c:1816
    #3 0x558119843282 in qemu_spice_cursor_refresh_bh ui/spice-display.c:595
    #4 0x558119ac7fb6 in aio_bh_poll util/async.c:117
    #5 0x558119ad09cf in aio_dispatch util/aio-posix.c:459
    #6 0x558119ac7d0d in aio_ctx_dispatch util/async.c:268
    #7 0x7fe44bda8df3 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x4fdf3)
    #8 0x558119ace3ec in glib_pollfds_poll util/main-loop.c:218
    #9 0x558119ace3ec in os_host_main_loop_wait util/main-loop.c:241
    #10 0x558119ace3ec in main_loop_wait util/main-loop.c:517
    #11 0x558119320a55 in main_loop /root/rpmbuild/BUILD/qemu-4.1.0/vl.c:1791
    #12 0x558118f0de07 in main /root/rpmbuild/BUILD/qemu-4.1.0/vl.c:4473
    #13 0x7fe449ad6b66 in __libc_start_main (/lib64/libc.so.6+0x25b66)
    #14 0x558118f1add9 in _start (/usr/libexec/qemu-kvm+0x785dd9)

0x6290016a820c is located 12 bytes inside of 16400-byte region [0x6290016a8200,0x6290016ac210)
freed by thread T0 here:
    #0 0x7fe44c068c89 in free (/lib64/libasan.so.4+0x151c89)
    #1 0x7fe44bdaeb68 in g_free (/lib64/libglib-2.0.so.0+0x55b68)

previously allocated by thread T34 here:
    #0 0x7fe44c06935b in calloc (/lib64/libasan.so.4+0x15235b)
    #1 0x7fe44bdaeac0 in g_malloc0 (/lib64/libglib-2.0.so.0+0x55ac0)

Thread T34 created by T0 here:
    #0 0x7fe44c05b6ac in __interceptor_pthread_create (/lib64/libasan.so.4+0x1446ac)
    #1 0x7fe44a35a541  (/lib64/libspice-server.so.1+0x4f541)   red_worker_run-->red_worker_main
    #2 0xfffffffffffffffe  (<unknown module>)

SUMMARY: AddressSanitizer: heap-use-after-free ui/cursor.c:118 in cursor_put
Shadow bytes around the buggy address:
  0x0c52802ccff0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c52802cd000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c52802cd010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c52802cd020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c52802cd030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c52802cd040: fd[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c52802cd050: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c52802cd060: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c52802cd070: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c52802cd080: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c52802cd090: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
 Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==18386==ABORTING
2025-11-07 01:33:08.962+0000: shutting down, reason=crashed

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