From ea81146c1515a35481103388a0e1e37aecab4933 Mon Sep 17 00:00:00 2001 From: cinap_lenrek Date: Fri, 25 Jan 2013 14:14:31 +0100 Subject: [PATCH] jpg: check read count when reading png magic (harmless) --- sys/src/cmd/jpg/readpng.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sys/src/cmd/jpg/readpng.c b/sys/src/cmd/jpg/readpng.c index a4c54e89e..ef14e013f 100644 --- a/sys/src/cmd/jpg/readpng.c +++ b/sys/src/cmd/jpg/readpng.c @@ -388,8 +388,8 @@ readslave(Biobuf *b) ZlibW zw; buf = pngmalloc(IDATSIZE, 0); - Bread(b, buf, sizeof PNGmagic); - if(memcmp(PNGmagic, buf, sizeof PNGmagic) != 0) + if(Bread(b, buf, sizeof PNGmagic) != sizeof PNGmagic + || memcmp(PNGmagic, buf, sizeof PNGmagic) != 0) sysfatal("bad PNGmagic"); n = getchunk(b, type, buf, IDATSIZE);