29 lines
742 B
Diff
29 lines
742 B
Diff
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From a7c525191aa725f4ebb7b489cdd7dd854a4e42fb Mon Sep 17 00:00:00 2001
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From: Uwe Ohse <uwe@ohse.de>
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Date: Sun, 1 Mar 2020 22:35:28 +0000
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Subject: [PATCH] may-be-security-fix: avoid possible underflow
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Fixes: CVE-2018-10195
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[a.heider: mention CVE in commit message]
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---
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src/zm.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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--- a/src/zm.c
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+++ b/src/zm.c
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@@ -432,10 +432,11 @@ zsdata(const char *buf, size_t length, i
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VPRINTF(3,("zsdata: %lu %s", (unsigned long) length,
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Zendnames[(frameend-ZCRCE)&3]));
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crc = 0;
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- do {
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+ while (length>0) {
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zsendline(*buf); crc = updcrc((0377 & *buf), crc);
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buf++;
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- } while (--length>0);
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+ length--;
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+ }
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xsendline(ZDLE); xsendline(frameend);
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crc = updcrc(frameend, crc);
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