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common: Use iobuf_get_noeof to avoid undefined behaviors.

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* common/iobuf.c (block_filter): Use iobuf_get_noeof.

--

Cherry-pick from master commit of:
	f80346f42df4bdc7d0a9741c3922129aceae4f81

When singed integer has negative value, left shift computation is
undefined in C.

GnuPG-bug-id: 4093
Reported-by: Philippe Antoine
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2018-09-10 13:44:47 +09:00
parent 213379debe
commit 0383e7fed7
1 changed files with 3 additions and 3 deletions
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6
common/iobuf.c
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@ -856,9 +856,9 @@ block_filter (void *opaque, int control, iobuf_t chain, byte * buffer,
}
else if (c == 255)
{
a->size = (size_t)iobuf_get (chain) << 24;
a->size |= iobuf_get (chain) << 16;
a->size |= iobuf_get (chain) << 8;
a->size = iobuf_get_noeof (chain) << 24;
a->size |= iobuf_get_noeof (chain) << 16;
a->size |= iobuf_get_noeof (chain) << 8;
if ((c = iobuf_get (chain)) == -1)
{
log_error ("block_filter: invalid 4 byte length\n");