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From f76275d4a91b28d687250525d3a0c5509bbd666f Mon Sep 17 00:00:00 2001
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From: Sebastian Pipping <sebastian@pipping.org>
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Date: Sun, 23 Sep 2018 21:30:39 +0200
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Subject: [PATCH] UriQuery.c: Catch integer overflow in ComposeQuery and ...Ex
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---
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lib/UriQuery.c | 14 ++++++++++++--
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1 files changed, 12 insertions(+), 2 deletions(-)
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diff --git a/lib/UriQuery.c b/lib/UriQuery.c
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index 45acf5a..9165ec8 100644
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--- a/lib/UriQuery.c
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+++ b/lib/UriQuery.c
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@@ -64,6 +64,10 @@
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+#include <limits.h>
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+
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+
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+
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static int URI_FUNC(ComposeQueryEngine)(URI_CHAR * dest,
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const URI_TYPE(QueryList) * queryList,
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int maxChars, int * charsWritten, int * charsRequired,
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@@ -197,9 +201,15 @@ int URI_FUNC(ComposeQueryEngine)(URI_CHAR * dest,
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const URI_CHAR * const value = queryList->value;
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const int worstCase = (normalizeBreaks == URI_TRUE ? 6 : 3);
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const int keyLen = (key == NULL) ? 0 : (int)URI_STRLEN(key);
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- const int keyRequiredChars = worstCase * keyLen;
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+ int keyRequiredChars;
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const int valueLen = (value == NULL) ? 0 : (int)URI_STRLEN(value);
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- const int valueRequiredChars = worstCase * valueLen;
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+ int valueRequiredChars;
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+
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+ if ((keyLen >= INT_MAX / worstCase) || (valueLen >= INT_MAX / worstCase)) {
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+ return URI_ERROR_OUTPUT_TOO_LARGE;
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+ }
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+ keyRequiredChars = worstCase * keyLen;
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+ valueRequiredChars = worstCase * valueLen;
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if (dest == NULL) {
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if (firstItem == URI_TRUE) {
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