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rewrite integer overflow tests w/o SIZE_T_MAX

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15662 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2005-07-19 15:08:18 +00:00
parent eaaf5d23fd
commit 0f15be4a2d
1 changed files with 5 additions and 3 deletions
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8
lib/asn1/der_get.c
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@@ -137,7 +137,7 @@ der_get_general_string (const unsigned char *p, size_t len,
{
char *s;
if (len > SIZE_T_MAX - 1)
if (len > len + 1)
return ASN1_BAD_LENGTH;
s = malloc (len + 1);
@@ -339,7 +339,7 @@ der_get_oid (const unsigned char *p, size_t len,
if (len < 1)
return ASN1_OVERRUN;
if (len > SIZE_T_MAX - 1)
if (len > len + 1)
return ASN1_BAD_LENGTH;
data->components = malloc((len + 1) * sizeof(*data->components));
@@ -485,7 +485,9 @@ der_get_bit_string (const unsigned char *p, size_t len,
return ASN1_BAD_FORMAT;
if (len - 1 == 0 && p[0] != 0)
return ASN1_BAD_FORMAT;
if (len - 1 > SIZE_T_MAX / 8)
/* check if any of the three upper bits are set
* any of them will cause a interger overrun */
if ((len - 1) >> (sizeof(len) * 8 - 3))
return ASN1_OVERRUN;
data->length = (len - 1) * 8;
data->data = malloc(len - 1);