diff options
Diffstat (limited to 'usr/src/uts/common/io/stream.c')
| -rw-r--r-- | usr/src/uts/common/io/stream.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/usr/src/uts/common/io/stream.c b/usr/src/uts/common/io/stream.c index b23036e9c5..658735b784 100644 --- a/usr/src/uts/common/io/stream.c +++ b/usr/src/uts/common/io/stream.c @@ -1605,7 +1605,9 @@ pullupmsg(mblk_t *mp, ssize_t len) ASSERT(bp->b_datap->db_ref > 0); ASSERT(bp->b_wptr >= bp->b_rptr); n = MIN(bp->b_wptr - bp->b_rptr, len); - bcopy(bp->b_rptr, mp->b_wptr, (size_t)n); + ASSERT(n >= 0); /* allow zero-length mblk_t's */ + if (n > 0) + bcopy(bp->b_rptr, mp->b_wptr, (size_t)n); mp->b_wptr += n; bp->b_rptr += n; len -= n; |