Lars Hjemli <[email protected]> wrote:
> On Sun, Sep 18, 2011 at 00:25, Jamie Couture <[email protected]> wrote:
> > - limit LCS table size: 128x128.
> > - move LCS table to global context: avoid allocating/freeing memory
> >  for every deferred line change.
> 
> Thanks, finally applied (to stable).

Hi, I got new segfaults with this patch, the following should
fix them.

From 2d9ae9c3369d537259822a6dd64a13963cc4fdbf Mon Sep 17 00:00:00 2001
From: Eric Wong <[email protected]>
Date: Wed, 04 Jan 2012 08:57:43 +0000
Subject: [PATCH 2/2] correct length check for LCS table

Each individual string may be too long for its respective
dimension of the LCS table.

Signed-off-by: Eric Wong <[email protected]>
---
 ui-ssdiff.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/ui-ssdiff.c b/ui-ssdiff.c
index 9fb5b11..45770b1 100644
--- a/ui-ssdiff.c
+++ b/ui-ssdiff.c
@@ -42,14 +42,12 @@ static char *longest_common_subsequence(char *A, char *B)
        int i, j, ri;
        int m = strlen(A);
        int n = strlen(B);
-       int tmp1, tmp2, length;
+       int tmp1, tmp2;
        int lcs_length;
        char *result;
 
-       length = (m + 1) * (n + 1);
-
        // We bail if the lines are too long
-       if (length > MAX_SSDIFF_SIZE)
+       if (m >= MAX_SSDIFF_M || n >= MAX_SSDIFF_N)
                return NULL;
 
        create_or_reset_lcs_table();
-- 
Eric Wong

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