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42 lines
914 B
42 lines
914 B
Description: Fix out-of-bounds read
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We need to handle possible overflows, by using an int instead of a short,
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and terminating if after computing the index it is out-of-bounds.
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Author: Guillem Jover <guillem@debian.org>
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Origin: vendor
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Bug-Debian: https://bugs.debian.org/783948
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Forwarded: no
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Last-Update: 2015-07-01
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---
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--- arj-3.10.22.orig/decode.c
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+++ arj-3.10.22/decode.c
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@@ -416,10 +416,10 @@ static void NEAR decode_end()
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void decode(int action)
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{
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- short i;
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- short r;
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- short c;
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- static short j;
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+ int i;
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+ int r;
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+ int c;
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+ static int j;
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#if SFX_LEVEL>=ARJSFXV
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if(!setjmp(decode_proc))
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@@ -450,9 +450,12 @@ void decode(int action)
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{
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j=c-(UCHAR_MAX+1-THRESHOLD);
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count-=(unsigned long)j;
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- i=r-decode_p()-1;
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+ int P = decode_p();
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+ i=r-P-1;
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if(i<0)
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i+=DICSIZ;
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+ if(i<0)
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+ goto termination;
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if(r>i&&r<DICSIZ-MAXMATCH-1)
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{
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while(--j>=0)
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