On Mon, 27 Apr 2009, Dmitry Potapov wrote:
>
> I have tried a few version of Git and got "Segmentation fault" when
> run:
>
> $ git grep '('
>
> I am not very familiar with grep code and don't have time to dig
> into it right now. So, maybe someone else can take a look at it.
Good job.
Something like this should fix it.
Linus
---
grep.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/grep.c b/grep.c
index f3a27d7..04c777a 100644
--- a/grep.c
+++ b/grep.c
@@ -72,6 +72,8 @@ 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:
@@ -84,8 +86,6 @@ 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;
@@ -101,6 +101,8 @@ 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)
@@ -372,6 +374,8 @@ static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
int h = 0;
regmatch_t match;
+ if (!x)
+ die("Not a valid grep expression");
switch (x->node) {
case GREP_NODE_ATOM:
h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
--
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