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grep: fix segfault when "git grep '('" is given

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent d649048 commit c922b01f54c4bebe84daeacf014cfbc8dc68479b @torvalds torvalds committed with gitster Apr 27, 2009
Showing with 10 additions and 2 deletions.
  1. +6 −2 grep.c
  2. +4 −0 t/t7002-grep.sh
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8 grep.c
@@ -54,6 +54,8 @@ static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
struct grep_expr *x;
p = *list;
+ if (!p)
+ return NULL;
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
@@ -66,8 +68,6 @@ static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
case GREP_OPEN_PAREN:
*list = p->next;
x = compile_pattern_or(list);
- if (!x)
- return NULL;
if (!*list || (*list)->token != GREP_CLOSE_PAREN)
die("unmatched parenthesis");
*list = (*list)->next;
@@ -83,6 +83,8 @@ static struct grep_expr *compile_pattern_not(struct grep_pat **list)
struct grep_expr *x;
p = *list;
+ if (!p)
+ return NULL;
switch (p->token) {
case GREP_NOT:
if (!p->next)
@@ -361,6 +363,8 @@ static int match_expr_eval(struct grep_opt *o,
{
int h = 0;
+ if (!x)
+ die("Not a valid grep expression");
switch (x->node) {
case GREP_NODE_ATOM:
h = match_one_pattern(o, x->u.atom, bol, eol, ctx);
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@@ -26,6 +26,10 @@ test_expect_success setup '
git commit -m initial
'
+test_expect_success 'grep should not segfault with a bad input' '
+ test_must_fail git grep "("
+'
+
for H in HEAD ''
do
case "$H" in

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