From: Zdenek Hutyra Date: Mon, 20 Jan 2025 16:13:46 +0000 Subject: PDF interpreter - Guard against unsigned int overflow Origin: https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=ef42ff180a04926e187d40faea40d4a43e304e3b Bug: https://bugs.ghostscript.com/show_bug.cgi?id=708253 Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2025-27834 Bug #708253 - see bug report for details. CVE-2025-27834 --- pdf/pdf_func.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/pdf/pdf_func.c b/pdf/pdf_func.c index 635fdac54f2e..93492c783971 100644 --- a/pdf/pdf_func.c +++ b/pdf/pdf_func.c @@ -153,6 +153,9 @@ pdfi_parse_type4_func_stream(pdf_context *ctx, pdf_c_stream *function_stream, in byte *p = (ops ? ops + *size : NULL); while (1) { + if (*size > max_uint / 2) + return gs_note_error(gs_error_VMerror); + c = pdfi_read_byte(ctx, function_stream); if (c < 0) break; @@ -321,6 +324,11 @@ pdfi_build_function_4(pdf_context *ctx, gs_function_params_t * mnDR, if (code < 0) goto function_4_error; + if (size > max_uint - 1) { + code = gs_note_error(gs_error_VMerror); + goto function_4_error; + } + ops = gs_alloc_string(ctx->memory, size + 1, "pdfi_build_function_4(ops)"); if (ops == NULL) { code = gs_error_VMerror; @@ -825,6 +833,11 @@ int pdfi_build_halftone_function(pdf_context *ctx, gs_function_t ** ppfn, byte * if (code < 0) goto halftone_function_error; + if (size > max_uint - 1) { + code = gs_note_error(gs_error_VMerror); + goto halftone_function_error; + } + ops = gs_alloc_string(ctx->memory, size + 1, "pdfi_build_halftone_function(ops)"); if (ops == NULL) { code = gs_error_VMerror; -- 2.49.0