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Merge pull request #748 from emersion/fix-xwm-read-data-source-segfault

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Fix segfault in xwm_read_data_source
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Tony Crisci 2018-03-27 00:27:16 -04:00 committed by GitHub
commit 84ce2afe26
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 49 additions and 48 deletions
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97
xwayland/selection.c
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@ -47,7 +47,21 @@ static int xwm_selection_flush_source_data(struct wlr_xwm_selection *selection)
return length; return length;
} }
static int xwm_read_data_source(int fd, uint32_t mask, void *data) { static void xwm_data_source_remove_property_source(
struct wlr_xwm_selection *selection) {
if (selection->property_source) {
wl_event_source_remove(selection->property_source);
}
selection->property_source = NULL;
}
static void xwm_data_source_close_source_fd(
struct wlr_xwm_selection *selection) {
close(selection->source_fd);
selection->source_fd = -1;
}
static int xwm_data_source_read(int fd, uint32_t mask, void *data) {
struct wlr_xwm_selection *selection = data; struct wlr_xwm_selection *selection = data;
struct wlr_xwm *xwm = selection->xwm; struct wlr_xwm *xwm = selection->xwm;
@ -72,13 +86,13 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
} }
wlr_log(L_DEBUG, "read %d (available %d, mask 0x%x) bytes: \"%.*s\"", wlr_log(L_DEBUG, "read %d (available %d, mask 0x%x) bytes: \"%.*s\"",
len, available, mask, len, (char *) p); len, available, mask, len, (char *) p);
selection->source_data.size = current + len; selection->source_data.size = current + len;
if (selection->source_data.size >= incr_chunk_size) { if (selection->source_data.size >= incr_chunk_size) {
if (!selection->incr) { if (!selection->incr) {
wlr_log(L_DEBUG, "got %zu bytes, starting incr", wlr_log(L_DEBUG, "got %zu bytes, starting incr",
selection->source_data.size); selection->source_data.size);
selection->incr = 1; selection->incr = 1;
xcb_change_property(xwm->xcb_conn, xcb_change_property(xwm->xcb_conn,
XCB_PROP_MODE_REPLACE, XCB_PROP_MODE_REPLACE,
@ -89,20 +103,17 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
1, &incr_chunk_size); 1, &incr_chunk_size);
selection->property_set = true; selection->property_set = true;
selection->flush_property_on_delete = 1; selection->flush_property_on_delete = 1;
wl_event_source_remove(selection->property_source); xwm_data_source_remove_property_source(selection);
selection->property_source = NULL;
xwm_selection_send_notify(selection, selection->request.property); xwm_selection_send_notify(selection, selection->request.property);
} else if (selection->property_set) { } else if (selection->property_set) {
wlr_log(L_DEBUG, "got %zu bytes, waiting for " wlr_log(L_DEBUG, "got %zu bytes, waiting for property delete",
"property delete", selection->source_data.size); selection->source_data.size);
selection->flush_property_on_delete = 1; selection->flush_property_on_delete = 1;
wl_event_source_remove(selection->property_source); xwm_data_source_remove_property_source(selection);
selection->property_source = NULL;
} else { } else {
wlr_log(L_DEBUG, "got %zu bytes, " wlr_log(L_DEBUG, "got %zu bytes, property deleted, setting new "
"property deleted, setting new property", "property", selection->source_data.size);
selection->source_data.size);
xwm_selection_flush_source_data(selection); xwm_selection_flush_source_data(selection);
} }
} else if (len == 0 && !selection->incr) { } else if (len == 0 && !selection->incr) {
@ -111,9 +122,8 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
xwm_selection_flush_source_data(selection); xwm_selection_flush_source_data(selection);
xwm_selection_send_notify(selection, selection->request.property); xwm_selection_send_notify(selection, selection->request.property);
xcb_flush(xwm->xcb_conn); xcb_flush(xwm->xcb_conn);
wl_event_source_remove(selection->property_source); xwm_data_source_remove_property_source(selection);
selection->property_source = NULL; xwm_data_source_close_source_fd(selection);
close(fd);
wl_array_release(&selection->source_data); wl_array_release(&selection->source_data);
selection->request.requestor = XCB_NONE; selection->request.requestor = XCB_NONE;
} else if (len == 0 && selection->incr) { } else if (len == 0 && selection->incr) {
@ -121,20 +131,16 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
selection->flush_property_on_delete = 1; selection->flush_property_on_delete = 1;
if (selection->property_set) { if (selection->property_set) {
wlr_log(L_DEBUG, "got %zu bytes, waiting for " wlr_log(L_DEBUG, "got %zu bytes, waiting for property delete",
"property delete", selection->source_data.size); selection->source_data.size);
} else { } else {
wlr_log(L_DEBUG, "got %zu bytes, " wlr_log(L_DEBUG, "got %zu bytes, property deleted, setting new "
"property deleted, setting new property", "property", selection->source_data.size);
selection->source_data.size);
xwm_selection_flush_source_data(selection); xwm_selection_flush_source_data(selection);
} }
xcb_flush(xwm->xcb_conn); xcb_flush(xwm->xcb_conn);
wl_event_source_remove(selection->property_source); xwm_data_source_remove_property_source(selection);
selection->property_source = NULL; xwm_data_source_close_source_fd(selection);
close(selection->source_fd);
selection->source_fd = -1;
close(fd);
} else { } else {
wlr_log(L_DEBUG, "nothing happened, buffered the bytes"); wlr_log(L_DEBUG, "nothing happened, buffered the bytes");
} }
@ -143,9 +149,8 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
error_out: error_out:
xwm_selection_send_notify(selection, XCB_ATOM_NONE); xwm_selection_send_notify(selection, XCB_ATOM_NONE);
wl_event_source_remove(selection->property_source); xwm_data_source_remove_property_source(selection);
selection->property_source = NULL; xwm_data_source_close_source_fd(selection);
close(fd);
wl_array_release(&selection->source_data); wl_array_release(&selection->source_data);
return 0; return 0;
} }
@ -191,9 +196,7 @@ static void xwm_selection_send_data(struct wlr_xwm_selection *selection,
struct wl_event_loop *loop = struct wl_event_loop *loop =
wl_display_get_event_loop(selection->xwm->xwayland->wl_display); wl_display_get_event_loop(selection->xwm->xwayland->wl_display);
selection->property_source = wl_event_loop_add_fd(loop, selection->property_source = wl_event_loop_add_fd(loop,
selection->source_fd, selection->source_fd, WL_EVENT_READABLE, xwm_data_source_read,
WL_EVENT_READABLE,
xwm_read_data_source,
selection); selection);
xwm_selection_source_send(selection, mime_type, p[1]); xwm_selection_source_send(selection, mime_type, p[1]);
@ -371,7 +374,13 @@ static void xwm_handle_selection_request(struct wlr_xwm *xwm,
} }
} }
static int writable_callback(int fd, uint32_t mask, void *data) { static void xwm_data_source_destroy_property_reply(
struct wlr_xwm_selection *selection) {
free(selection->property_reply);
selection->property_reply = NULL;
}
static int xwm_data_source_write(int fd, uint32_t mask, void *data) {
struct wlr_xwm_selection *selection = data; struct wlr_xwm_selection *selection = data;
struct wlr_xwm *xwm = selection->xwm; struct wlr_xwm *xwm = selection->xwm;
@ -381,13 +390,9 @@ static int writable_callback(int fd, uint32_t mask, void *data) {
int len = write(fd, property + selection->property_start, remainder); int len = write(fd, property + selection->property_start, remainder);
if (len == -1) { if (len == -1) {
free(selection->property_reply); xwm_data_source_destroy_property_reply(selection);
selection->property_reply = NULL; xwm_data_source_remove_property_source(selection);
if (selection->property_source) { xwm_data_source_close_source_fd(selection);
wl_event_source_remove(selection->property_source);
}
selection->property_source = NULL;
close(fd);
wlr_log(L_ERROR, "write error to target fd: %m"); wlr_log(L_ERROR, "write error to target fd: %m");
return 1; return 1;
} }
@ -398,12 +403,8 @@ static int writable_callback(int fd, uint32_t mask, void *data) {
selection->property_start += len; selection->property_start += len;
if (len == remainder) { if (len == remainder) {
free(selection->property_reply); xwm_data_source_destroy_property_reply(selection);
selection->property_reply = NULL; xwm_data_source_remove_property_source(selection);
if (selection->property_source) {
wl_event_source_remove(selection->property_source);
}
selection->property_source = NULL;
if (selection->incr) { if (selection->incr) {
xcb_delete_property(xwm->xcb_conn, xcb_delete_property(xwm->xcb_conn,
@ -411,7 +412,7 @@ static int writable_callback(int fd, uint32_t mask, void *data) {
xwm->atoms[WL_SELECTION]); xwm->atoms[WL_SELECTION]);
} else { } else {
wlr_log(L_DEBUG, "transfer complete"); wlr_log(L_DEBUG, "transfer complete");
close(fd); xwm_data_source_close_source_fd(selection);
} }
} }
@ -422,13 +423,13 @@ static void xwm_write_property(struct wlr_xwm_selection *selection,
xcb_get_property_reply_t *reply) { xcb_get_property_reply_t *reply) {
selection->property_start = 0; selection->property_start = 0;
selection->property_reply = reply; selection->property_reply = reply;
writable_callback(selection->source_fd, WL_EVENT_WRITABLE, selection); xwm_data_source_write(selection->source_fd, WL_EVENT_WRITABLE, selection);
if (selection->property_reply) { if (selection->property_reply) {
struct wl_event_loop *loop = struct wl_event_loop *loop =
wl_display_get_event_loop(selection->xwm->xwayland->wl_display); wl_display_get_event_loop(selection->xwm->xwayland->wl_display);
selection->property_source = wl_event_loop_add_fd(loop, selection->property_source = wl_event_loop_add_fd(loop,
selection->source_fd, WL_EVENT_WRITABLE, writable_callback, selection->source_fd, WL_EVENT_WRITABLE, xwm_data_source_write,
selection); selection);
} }
} }