wlroots/types/wlr_tablet_pad.c

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#include <stdlib.h>
#include <string.h>
#include <wayland-server-core.h>
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#include <wlr/interfaces/wlr_tablet_pad.h>
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#include <wlr/types/wlr_tablet_pad.h>
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void wlr_tablet_pad_init(struct wlr_tablet_pad *pad,
struct wlr_tablet_pad_impl *impl) {
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pad->impl = impl;
wl_signal_init(&pad->events.button);
wl_signal_init(&pad->events.ring);
wl_signal_init(&pad->events.strip);
wl_signal_init(&pad->events.attach_tablet);
wl_list_init(&pad->groups);
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wl_array_init(&pad->paths);
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}
void wlr_tablet_pad_destroy(struct wlr_tablet_pad *pad) {
if (!pad) {
return;
}
Fix invalid uses of wl_array_for_each [1] and [2] have introduced new wl_array usage in wlroots, but contains a mistake: wl_array_for_each iterates over pointers to the wl_array entries, not over entries themselves. Fix all wl_array_for_each call sites. Name the variables "ptr" to avoid confusion. Found via ASan: ==148752==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x602000214111 in thread T0 #0 0x7f6ff2235f19 in __interceptor_free /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:127 #1 0x7f6ff1c04004 in wlr_tablet_destroy ../subprojects/wlroots/types/wlr_tablet_tool.c:24 #2 0x7f6ff1b8463c in wlr_input_device_destroy ../subprojects/wlroots/types/wlr_input_device.c:51 #3 0x7f6ff1ab9941 in backend_destroy ../subprojects/wlroots/backend/wayland/backend.c:306 #4 0x7f6ff1a68323 in wlr_backend_destroy ../subprojects/wlroots/backend/backend.c:57 #5 0x7f6ff1ab36b4 in multi_backend_destroy ../subprojects/wlroots/backend/multi/backend.c:57 #6 0x7f6ff1ab417c in handle_display_destroy ../subprojects/wlroots/backend/multi/backend.c:124 #7 0x7f6ff106184e in wl_display_destroy (/usr/lib/libwayland-server.so.0+0x884e) #8 0x55cd1a77c9e5 in server_fini ../sway/server.c:218 #9 0x55cd1a77893f in main ../sway/main.c:400 #10 0x7f6ff04bdb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24) #11 0x55cd1a73a7ad in _start (/home/simon/src/sway/build/sway/sway+0x33a7ad) 0x602000214111 is located 1 bytes inside of 16-byte region [0x602000214110,0x602000214120) freed by thread T0 here: #0 0x7f6ff2235f19 in __interceptor_free /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:127 #1 0x7f6ff1c04004 in wlr_tablet_destroy ../subprojects/wlroots/types/wlr_tablet_tool.c:24 #2 0x7f6ff1b8463c in wlr_input_device_destroy ../subprojects/wlroots/types/wlr_input_device.c:51 #3 0x7f6ff1ab9941 in backend_destroy ../subprojects/wlroots/backend/wayland/backend.c:306 #4 0x7f6ff1a68323 in wlr_backend_destroy ../subprojects/wlroots/backend/backend.c:57 #5 0x7f6ff1ab36b4 in multi_backend_destroy ../subprojects/wlroots/backend/multi/backend.c:57 #6 0x7f6ff1ab417c in handle_display_destroy ../subprojects/wlroots/backend/multi/backend.c:124 #7 0x7f6ff106184e in wl_display_destroy (/usr/lib/libwayland-server.so.0+0x884e) previously allocated by thread T0 here: #0 0x7f6ff2236279 in __interceptor_malloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:145 #1 0x7f6ff1066d03 in wl_array_add (/usr/lib/libwayland-server.so.0+0xdd03) [1]: https://github.com/swaywm/wlroots/pull/3002 [2]: https://github.com/swaywm/wlroots/pull/3004
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char **path_ptr;
wl_array_for_each(path_ptr, &pad->paths) {
free(*path_ptr);
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}
wl_array_release(&pad->paths);
if (pad->impl && pad->impl->destroy) {
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pad->impl->destroy(pad);
} else {
free(pad);
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}
}