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swaybar: fail gracefully on tokener creation fail

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This commit adds missing error-handling to the creation of the tokener
instance. The stack depth parameter is used to initialize an array that
json-c prefaults ahead of time, causing INT_MAX to result in out of
memory errors.

Also drop the depth to 256 to prevent this OOM.

Though this fix is not very satisfactory -- json-c could be made to
not prefault -- it should do for now. At the very least, swaybar will
not crash.

Fixes #6126.
This commit is contained in:
Tudor Brindus 2021-03-22 09:01:00 -04:00 committed by Simon Ser
parent 47f1f9b63e
commit 03daa53a0e
1 changed files with 10 additions and 1 deletions
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11
swaybar/ipc.c
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@ -547,7 +547,16 @@ bool handle_ipc_readable(struct swaybar *bar) {
return false;
}
json_tokener *tok = json_tokener_new_ex(INT_MAX);
// The default depth of 32 is too small to represent some nested layouts, but
// we can't pass INT_MAX here because json-c (as of this writing) prefaults
// all the memory for its stack.
json_tokener *tok = json_tokener_new_ex(256);
if (!tok) {
sway_log_errno(SWAY_ERROR, "failed to create tokener");
free_ipc_response(resp);
return false;
}
json_object *result = json_tokener_parse_ex(tok, resp->payload, -1);
enum json_tokener_error err = json_tokener_get_error(tok);
json_tokener_free(tok);