From: Chris Liddell Date: Thu, 23 Aug 2018 11:20:56 +0000 (+0100) Subject: Bug 699668: handle stack overflow during error handling X-Git-Tag: ghostpdl-9.24rc1~17 X-Git-Url: http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff_plain;h=b575e1ec Bug 699668: handle stack overflow during error handling When handling a Postscript error, we push the object throwing the error onto the operand stack for the error handling procedure to access - we were not checking the available stack before doing so, thus causing a crash. Basically, if we get a stack overflow when already handling an error, we're out of options, return to the caller with a fatal error. --- diff --git a/psi/interp.c b/psi/interp.c index 8b49556..6150838 100644 --- a/psi/interp.c +++ b/psi/interp.c @@ -676,7 +676,12 @@ again: /* Push the error object on the operand stack if appropriate. */ if (!GS_ERROR_IS_INTERRUPT(code)) { /* Replace the error object if within an oparray or .errorexec. */ - *++osp = *perror_object; + osp++; + if (osp >= ostop) { + *pexit_code = gs_error_Fatal; + return_error(gs_error_Fatal); + } + *osp = *perror_object; errorexec_find(i_ctx_p, osp); } goto again;