[PATCH] Add overflow check to get_delta_hdr_size

[Martin Koegler]

From: Martin Koegler <martin.koeg...@chello.at>

Signed-off-by: Martin Koegler <martin.koeg...@chello.at>
---
Applies on top of my size_t series

I'm not sure, if die or error is better.

 delta.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/delta.h b/delta.h
index 2df0f55..18a4983 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) {
+                       error("too large object size");
+                       size = 0;
+                       break;
+               }
        } while (cmd & 0x80 && data < top);
        *datap = data;
        return size;
-- 
2.1.4