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jpg: check read count when reading png magic (harmless)

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This commit is contained in:
cinap_lenrek 2013-01-25 14:14:31 +01:00
parent 188153b7df
commit ea81146c15
1 changed files with 2 additions and 2 deletions
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4
sys/src/cmd/jpg/readpng.c
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@ -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);