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-rw-r--r--diffcore-rename.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/diffcore-rename.c b/diffcore-rename.c
index 6bde4396f..41b35c3a9 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -298,10 +298,25 @@ void diffcore_rename(struct diff_options *options)
else if (detect_rename == DIFF_DETECT_COPY)
register_rename_src(p->one, 1, p->score);
}
- if (rename_dst_nr == 0 || rename_src_nr == 0 ||
- (0 < rename_limit && rename_limit < rename_dst_nr))
+ if (rename_dst_nr == 0 || rename_src_nr == 0)
goto cleanup; /* nothing to do */
+ /*
+ * This basically does a test for the rename matrix not
+ * growing larger than a "rename_limit" square matrix, ie:
+ *
+ * rename_dst_nr * rename_src_nr > rename_limit * rename_limit
+ *
+ * but handles the potential overflow case specially (and we
+ * assume at least 32-bit integers)
+ */
+ if (rename_limit <= 0 || rename_limit > 32767)
+ rename_limit = 32767;
+ if (rename_dst_nr > rename_limit && rename_src_nr > rename_limit)
+ goto cleanup;
+ if (rename_dst_nr * rename_src_nr > rename_limit * rename_limit)
+ goto cleanup;
+
/* We really want to cull the candidates list early
* with cheap tests in order to avoid doing deltas.
* The first round matches up the up-to-date entries,