tSome more overflow checks - dedup - deduplicating backup program
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       ---
 (DIR) commit 3609b47d0d3af4279f5b9988a92dd47c4a06a777
 (DIR) parent 945cb23311f465794117121580c362dc5f67de83
 (HTM) Author: sin <sin@2f30.org>
       Date:   Wed, 27 Feb 2019 09:42:00 +0000
       
       Some more overflow checks
       
       Diffstat:
         M types.c                             |      10 ++++++++--
       
       1 file changed, 8 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/types.c b/types.c
       t@@ -156,8 +156,14 @@ write_snapshot(int fd, struct snapshot *snap)
        
                snprintf(fmt, sizeof(fmt), "q'%d'%dq", MSGSIZE, MDSIZE);
        
       -        snap->size = SNAPHDR_LEN;
       -        snap->size += snap->nr_blk_descs * BLKDESC_LEN;
       +        if (mul_overflow(snap->nr_blk_descs, BLKDESC_LEN))
       +                errx(1, "write_snapshot: overflow");
       +        snap->size = snap->nr_blk_descs * BLKDESC_LEN;
       +
       +        if (add_overflow(SNAPHDR_LEN, snap->size))
       +                errx(1, "write_snapshot: overflow");
       +        snap->size += SNAPHDR_LEN;
       +
                n = pack(buf, fmt,
                         snap->size,
                         snap->msg,