3f31f56929
Xwayland's `xwl_destroy_window()` invokes `xwl_present_cleanup()` before the common `DestroyWindow()`. But then `DestroyWindow()` calls `present_destroy_window()` which will possibly end up in `xwl_present_abort_vblank()` which will try to access data that was previously freed by `xwl_present_cleanup()`: Invalid read of size 8 at 0x434184: xwl_present_abort_vblank (xwayland-present.c:378) by 0x53785B: present_wnmd_abort_vblank (present_wnmd.c:651) by 0x53695A: present_free_window_vblank (present_screen.c:87) by 0x53695A: present_destroy_window (present_screen.c:152) by 0x42A90D: xwl_destroy_window (xwayland.c:653) by 0x584298: compDestroyWindow (compwindow.c:613) by 0x53CEE3: damageDestroyWindow (damage.c:1570) by 0x4F1BB8: DbeDestroyWindow (dbe.c:1326) by 0x46F7F6: FreeWindowResources (window.c:1031) by 0x472847: DeleteWindow (window.c:1099) by 0x46B54C: doFreeResource (resource.c:880) by 0x46C706: FreeClientResources (resource.c:1146) by 0x446ADE: CloseDownClient (dispatch.c:3473) Address 0x182abde0 is 80 bytes inside a block of size 112 free'd at 0x4C2FDAC: free (vg_replace_malloc.c:530) by 0x42A937: xwl_destroy_window (xwayland.c:647) by 0x584298: compDestroyWindow (compwindow.c:613) by 0x53CEE3: damageDestroyWindow (damage.c:1570) by 0x4F1BB8: DbeDestroyWindow (dbe.c:1326) by 0x46F7F6: FreeWindowResources (window.c:1031) by 0x472847: DeleteWindow (window.c:1099) by 0x46B54C: doFreeResource (resource.c:880) by 0x46C706: FreeClientResources (resource.c:1146) by 0x446ADE: CloseDownClient (dispatch.c:3473) by 0x446DA5: ProcKillClient (dispatch.c:3279) by 0x4476AF: Dispatch (dispatch.c:479) Block was alloc'd at at 0x4C30B06: calloc (vg_replace_malloc.c:711) by 0x433F46: xwl_present_window_get_priv (xwayland-present.c:54) by 0x434228: xwl_present_get_crtc (xwayland-present.c:302) by 0x539728: proc_present_query_capabilities (present_request.c:227) by 0x4476AF: Dispatch (dispatch.c:479) by 0x44B5B5: dix_main (main.c:276) by 0x75F611A: (below main) (libc-start.c:308) This is because `xwl_present_cleanup()` frees the memory but does not remove it from the window's privates, and `xwl_present_abort_vblank()` will still find it and hence try to access that freed memory... Remove `xwl_present_window` from window's privates on cleanup so that no other function can find and reuse that data once it's freed. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1616269 Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> |
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.. | ||
.gitignore | ||
drm.xml | ||
Makefile.am | ||
meson.build | ||
xwayland-cursor.c | ||
xwayland-cvt.c | ||
xwayland-glamor-eglstream.c | ||
xwayland-glamor-gbm.c | ||
xwayland-glamor-xv.c | ||
xwayland-glamor.c | ||
xwayland-input.c | ||
xwayland-output.c | ||
xwayland-present.c | ||
xwayland-shm.c | ||
xwayland-vidmode.c | ||
xwayland.c | ||
xwayland.h |