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From 54e3d1414e1a031d6f635f8fcbe273eecfd65560 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Tue, 5 Feb 2019 12:06:00 +0100
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Subject: [PATCH 39/40] col: make flush_line() a little bit robust
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The code is horrible. The core of the problem are signed integers
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and no check for the limits.
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This patch fixes c->c_column = cur_col; where c_column is "short"
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and "cur_col" is int. Let's use "int" for all the variables. It's
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really not perfect as for bigger lines it can segfault again...
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The patch also removes some unnecessary static variables.
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Upstream: http://github.com/karelzak/util-linux/commit/004356f05018e3bfcaddd2652846659a4d8481f3
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1803753
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Addresses: https://github.com/karelzak/util-linux/issues/749
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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text-utils/col.c | 11 ++++++-----
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1 file changed, 6 insertions(+), 5 deletions(-)
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diff --git a/text-utils/col.c b/text-utils/col.c
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index 3d9e15d26..c2f8db64d 100644
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--- a/text-utils/col.c
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+++ b/text-utils/col.c
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@@ -88,7 +88,7 @@ typedef char CSET;
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typedef struct char_str {
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#define CS_NORMAL 1
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#define CS_ALTERNATE 2
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- short c_column; /* column character is in */
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+ int c_column; /* column character is in */
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CSET c_set; /* character set (currently only 2) */
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wchar_t c_char; /* character in question */
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int c_width; /* character width */
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@@ -476,8 +476,9 @@ void flush_line(LINE *l)
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nchars = l->l_line_len;
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if (l->l_needs_sort) {
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- static CHAR *sorted;
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- static int count_size, *count, i, save, sorted_size, tot;
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+ static CHAR *sorted = NULL;
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+ static int count_size = 0, *count = NULL, sorted_size = 0;
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+ int i, tot;
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/*
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* Do an O(n) sort on l->l_line by column being careful to
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@@ -494,7 +495,7 @@ void flush_line(LINE *l)
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(unsigned)sizeof(int) * count_size);
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}
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memset(count, 0, sizeof(int) * l->l_max_col + 1);
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- for (i = nchars, c = l->l_line; --i >= 0; c++)
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+ for (i = nchars, c = l->l_line; c && --i >= 0; c++)
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count[c->c_column]++;
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/*
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@@ -502,7 +503,7 @@ void flush_line(LINE *l)
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* indices into new line.
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*/
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for (tot = 0, i = 0; i <= l->l_max_col; i++) {
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- save = count[i];
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+ int save = count[i];
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count[i] = tot;
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tot += save;
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}
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--
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2.25.4
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