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diff --git a/extract.c b/extract.c
index c741b5f..e4a4c7b 100644
--- a/extract.c
+++ b/extract.c
@@ -2240,10 +2240,17 @@ static int test_compr_eb(__G__ eb, eb_size, compr_offset, test_uc_ebdata)
if (compr_offset < 4) /* field is not compressed: */
return PK_OK; /* do nothing and signal OK */
+ /* Return no/bad-data error status if any problem is found:
+ * 1. eb_size is too small to hold the uncompressed size
+ * (eb_ucsize). (Else extract eb_ucsize.)
+ * 2. eb_ucsize is zero (invalid). 2014-12-04 SMS.
+ * 3. eb_ucsize is positive, but eb_size is too small to hold
+ * the compressed data header.
+ */
if ((eb_size < (EB_UCSIZE_P + 4)) ||
- ((eb_ucsize = makelong(eb+(EB_HEADSIZE+EB_UCSIZE_P))) > 0L &&
- eb_size <= (compr_offset + EB_CMPRHEADLEN)))
- return IZ_EF_TRUNC; /* no compressed data! */
+ ((eb_ucsize = makelong( eb+ (EB_HEADSIZE+ EB_UCSIZE_P))) == 0L) ||
+ ((eb_ucsize > 0L) && (eb_size <= (compr_offset + EB_CMPRHEADLEN))))
+ return IZ_EF_TRUNC; /* no/bad compressed data! */
method = makeword(eb + (EB_HEADSIZE + compr_offset));
if ((method == STORED) && (eb_size != compr_offset + EB_CMPRHEADLEN + eb_ucsize))
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