log_tree_diff: die when we fail to parse a commit
We currently call parse_commit and then assume we can
dereference the resulting "tree" struct field. If parsing
failed, however, that field is NULL and we end up
segfaulting.
Instead of a segfault, let's print an error message and die
a little more gracefully.
Note that this should never happen in practice, but may
happen in a corrupt repository.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/commit.c b/commit.c
index a575564..26c1d54 100644
--- a/commit.c
+++ b/commit.c
@@ -341,6 +341,13 @@
return ret;
}
+void parse_commit_or_die(struct commit *item)
+{
+ if (parse_commit(item))
+ die("unable to parse commit %s",
+ item ? sha1_to_hex(item->object.sha1) : "(null)");
+}
+
int find_commit_subject(const char *commit_buffer, const char **subject)
{
const char *eol;
diff --git a/commit.h b/commit.h
index d912a9d..a3645da 100644
--- a/commit.h
+++ b/commit.h
@@ -49,6 +49,7 @@
int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size);
int parse_commit(struct commit *item);
+void parse_commit_or_die(struct commit *item);
/* Find beginning and length of commit subject. */
int find_commit_subject(const char *commit_buffer, const char **subject);
diff --git a/log-tree.c b/log-tree.c
index a49d8e8..11604b1 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -734,7 +734,7 @@
if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
return 0;
- parse_commit(commit);
+ parse_commit_or_die(commit);
sha1 = commit->tree->object.sha1;
/* Root commit? */
@@ -759,7 +759,7 @@
* parent, showing summary diff of the others
* we merged _in_.
*/
- parse_commit(parents->item);
+ parse_commit_or_die(parents->item);
diff_tree_sha1(parents->item->tree->object.sha1,
sha1, "", &opt->diffopt);
log_tree_diff_flush(opt);
@@ -774,7 +774,7 @@
for (;;) {
struct commit *parent = parents->item;
- parse_commit(parent);
+ parse_commit_or_die(parent);
diff_tree_sha1(parent->tree->object.sha1,
sha1, "", &opt->diffopt);
log_tree_diff_flush(opt);
