Add overflow check to get_delta_hdr_size

Signed-off-by: Martin Koegler <martin.koegler@chello.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/delta.h b/delta.h
index 2df0f5552b..dab7352591 100644
--- a/delta.h
+++ b/delta.h
@@ -96,6 +96,11 @@ static inline size_t get_delta_hdr_size(const unsigned char **datap,
 		cmd = *data++;
 		size |= (cmd & 0x7f) << i;
 		i += 7;
+		if (bitsizeof(size_t) <= i) {
+			die("too large object size");
+			size = 0;
+			break;
+		}
 	} while (cmd & 0x80 && data < top);
 	*datap = data;
 	return size;