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fix segfault when displaying empty blobs

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When size is zero, subtracting one from it turns it into
ULONG_MAX which causes an out-of-bounds access on buf.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
This commit is contained in:
Eric Wong 2009-03-14 18:41:47 -07:00 committed by Lars Hjemli
parent 6063e7b553
commit 112973615a
1 changed files with 8 additions and 5 deletions
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13
ui-tree.c
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@ -25,11 +25,14 @@ static void print_text_buffer(char *buf, unsigned long size)
html("<tr><td class='linenumbers'><pre>");
idx = 0;
lineno = 0;
htmlf(numberfmt, ++lineno);
while(idx < size - 1) { // skip absolute last newline
if (buf[idx] == '\n')
htmlf(numberfmt, ++lineno);
idx++;
if (size) {
htmlf(numberfmt, ++lineno);
while(idx < size - 1) { // skip absolute last newline
if (buf[idx] == '\n')
htmlf(numberfmt, ++lineno);
idx++;
}
}
html("</pre></td>\n");
html("<td class='lines'><pre><code>");