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line-range: fix infinite loop bug with '$' regex

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When the -L argument to "git log" is passed the zero-width regular
expression "$" (as in "-L :$:line-range.c"), this results in an
infinite loop in find_funcname_matching_regexp().

Modify find_funcname_matching_regexp to correctly match the entire line
instead of the zero-width match at eol and update the loop condition to
prevent an infinite loop in the event of other undiscovered corner cases.

The primary change is that we pre-decrement the beginning-of-line marker
('bol') before comparing it to '\n'. In the case of '$', where we match the
'\n' at the end of the line and start the loop with bol == eol, this
ensures that bol will find the beginning of the line on which the match
occurred.

Originally reported in <https://stackoverflow.com/q/74690545/147356>.

Signed-off-by: Lars Kellogg-Stedman <lars@oddbit.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Kellogg-Stedman
2022-12-19 17:48:50 -05:00
committed by Junio C Hamano
parent 8706a59933
commit 4e57c88e02
2 changed files with 26 additions and 3 deletions
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7
line-range.c
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@ -135,7 +135,7 @@ static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char
{
int reg_error;
regmatch_t match[1];
while (1) {
while (*start) {
const char *bol, *eol;
reg_error = regexec(regexp, start, 1, match, 0);
if (reg_error == REG_NOMATCH)
@ -148,8 +148,8 @@ static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char
/* determine extent of line matched */
bol = start+match[0].rm_so;
eol = start+match[0].rm_eo;
while (bol > start && *bol != '\n')
bol--;
while (bol > start && *--bol != '\n')
; /* nothing */
if (*bol == '\n')
bol++;
while (*eol && *eol != '\n')
@ -161,6 +161,7 @@ static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char
return bol;
start = eol;
}
return NULL;
}
static const char *parse_range_funcname(