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From 5bbd0a4b3c212425ace54bf8a8ede5b832776209 Mon Sep 17 00:00:00 2001
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From: Rainer Gerhards <rgerhards@adiscon.com>
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Date: Wed, 6 Sep 2017 13:16:42 +0200
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Subject: [PATCH] core: memory corruption during configuration parsing
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when omfwd is used with the $streamdriverpermittedpeers legacy
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parameter, a memory corruption can occur. This depends on the
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length of the provided strings and probably the malloc subsystem.
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Once config parsing succeeds, no problem can happen.
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Thanks to Brent Douglas for initially reporting this issue and
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providing great analysis.
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Thanks to github user bwdoll for analyzing this bug and providing
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a suggested fix (which is almost what this commit includes).
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closes https://github.com/rsyslog/rsyslog/issues/1408
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closes https://github.com/rsyslog/rsyslog/issues/1474
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---
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tools/omfwd.c | 4 ----
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1 file changed, 4 deletions(-)
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diff --git a/tools/omfwd.c b/tools/omfwd.c
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index 3bffbb3cc..8d51fbb51 100644
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--- a/tools/omfwd.c
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+++ b/tools/omfwd.c
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@@ -1157,7 +1157,6 @@ CODESTARTnewActInst
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pData->pszStrmDrvrAuthMode = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
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} else if(!strcmp(actpblk.descr[i].name, "streamdriverpermittedpeers")) {
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uchar *start, *str;
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- uchar save;
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uchar *p;
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int lenStr;
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str = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
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@@ -1170,8 +1169,6 @@ CODESTARTnewActInst
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if(*p == ',') {
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*p = '\0';
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}
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- save = *(p+1); /* we always have this, at least the \0 byte at EOS */
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- *(p+1) = '\0';
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if(*start == '\0') {
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DBGPRINTF("omfwd: ignoring empty permitted peer\n");
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} else {
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@@ -1181,7 +1178,6 @@ CODESTARTnewActInst
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start = p+1;
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if(lenStr)
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--lenStr;
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- *(p+1) = save;
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}
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free(str);
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} else if(!strcmp(actpblk.descr[i].name, "ziplevel")) {
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