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authorNeels Hofmeyr <neels@hofmeyr.de>2018-03-05 04:19:21 +0100
committerNeels Hofmeyr <neels@hofmeyr.de>2018-03-05 04:27:40 +0100
commit20f7d0ecb4d04bd20b132fadad50b3f914ed9fe0 (patch)
treefeaec8cfc30bd514de3aed142289123eddfec294
parent680acae725b2b8dda2f239ff20073306fdfb3f6e (diff)
fix osmo_mnc_from_str(): don't try to parse NULL
In osmo_mnc_from_str() do not try to return some values even if the validation fails; hence don't try to decode a NULL pointer. That whole idea was half-baked and a can of worms to begin with. Change-Id: Ibaaa128ac60b941a015a31134eb52aef56bc6e22
-rw-r--r--src/gsm/gsm23003.c14
-rw-r--r--tests/gsm23003/gsm23003_test.c16
-rw-r--r--tests/gsm23003/gsm23003_test.ok14
3 files changed, 21 insertions, 23 deletions
diff --git a/src/gsm/gsm23003.c b/src/gsm/gsm23003.c
index 1f6bf7d..574400d 100644
--- a/src/gsm/gsm23003.c
+++ b/src/gsm/gsm23003.c
@@ -206,7 +206,7 @@ void osmo_plmn_from_bcd(const uint8_t *bcd_src, struct osmo_plmn_id *plmn)
* \param mnc[out] MNC result buffer, or NULL.
* \param[out] mnc_3_digits Result buffer for 3-digit flag, or NULL.
* \returns zero on success, -EINVAL in case of surplus characters, negative errno in case of conversion
- * errors.
+ * errors. In case of error, do not modify the out-arguments.
*/
int osmo_mnc_from_str(const char *mnc_str, uint16_t *mnc, bool *mnc_3_digits)
{
@@ -215,19 +215,17 @@ int osmo_mnc_from_str(const char *mnc_str, uint16_t *mnc, bool *mnc_3_digits)
char *endptr;
int rc = 0;
- if (!mnc_str || !isdigit(mnc_str[0]) || strlen(mnc_str) > 3) {
- /* return invalid, but give strtol a shot anyway, for callers that don't want to be
- * strict */
- rc = -EINVAL;
- }
+ if (!mnc_str || !isdigit(mnc_str[0]) || strlen(mnc_str) > 3)
+ return -EINVAL;
+
errno = 0;
_mnc = strtol(mnc_str, &endptr, 10);
if (errno)
rc = -errno;
else if (*endptr)
- rc = -EINVAL;
+ return -EINVAL;
if (_mnc < 0 || _mnc > 999)
- rc = -EINVAL;
+ return -ERANGE;
_mnc_3_digits = strlen(mnc_str) > 2;
if (mnc)
diff --git a/tests/gsm23003/gsm23003_test.c b/tests/gsm23003/gsm23003_test.c
index ea08d0d..947aa18 100644
--- a/tests/gsm23003/gsm23003_test.c
+++ b/tests/gsm23003/gsm23003_test.c
@@ -136,14 +136,14 @@ static struct test_mnc_from_str test_mnc_from_strs[] = {
{ "001", { 0, 1, true } },
{ "", { -EINVAL, 0, false } },
{ " ", { -EINVAL, 0, false } },
- { "-1", { -EINVAL, 65535, false } },
- { "1000", { -EINVAL, 1000, true } },
+ { "-1", { -EINVAL, 0, false } },
+ { "1000", { -EINVAL, 0, false } },
{ "0x", { -EINVAL, 0, false } },
- { " 23", { -EINVAL, 23, true } }, /* technically not a 3-digit MNC, but it's EINVAL anyway */
- { "23 ", { -EINVAL, 23, true } },
- { " 023", { -EINVAL, 23, true } },
- { "023 ", { -EINVAL, 23, true } },
- { "023 ", { -EINVAL, 23, true } },
+ { " 23", { -EINVAL, 0, false } },
+ { "23 ", { -EINVAL, 0, false } },
+ { " 023", { -EINVAL, 0, false } },
+ { "023 ", { -EINVAL, 0, false } },
+ { "023 ", { -EINVAL, 0, false } },
};
static bool test_mnc_from_str()
@@ -154,7 +154,7 @@ static bool test_mnc_from_str()
for (i = 0; i < ARRAY_SIZE(test_mnc_from_strs); i++) {
struct test_mnc_from_str *t = &test_mnc_from_strs[i];
- struct test_mnc_from_str_result result;
+ struct test_mnc_from_str_result result = {};
bool ok;
result.rc = osmo_mnc_from_str(t->mnc_str, &result.mnc,
diff --git a/tests/gsm23003/gsm23003_test.ok b/tests/gsm23003/gsm23003_test.ok
index 565c38c..b435f45 100644
--- a/tests/gsm23003/gsm23003_test.ok
+++ b/tests/gsm23003/gsm23003_test.ok
@@ -51,11 +51,11 @@
5: "001" rc=0 mnc=1 mnc_3_digits=1 pass
6: "" rc=-22 mnc=0 mnc_3_digits=0 pass
7: " " rc=-22 mnc=0 mnc_3_digits=0 pass
- 8: "-1" rc=-22 mnc=65535 mnc_3_digits=0 pass
- 9: "1000" rc=-22 mnc=1000 mnc_3_digits=1 pass
+ 8: "-1" rc=-22 mnc=0 mnc_3_digits=0 pass
+ 9: "1000" rc=-22 mnc=0 mnc_3_digits=0 pass
10: "0x" rc=-22 mnc=0 mnc_3_digits=0 pass
-11: " 23" rc=-22 mnc=23 mnc_3_digits=1 pass
-12: "23 " rc=-22 mnc=23 mnc_3_digits=1 pass
-13: " 023" rc=-22 mnc=23 mnc_3_digits=1 pass
-14: "023 " rc=-22 mnc=23 mnc_3_digits=1 pass
-15: "023 " rc=-22 mnc=23 mnc_3_digits=1 pass
+11: " 23" rc=-22 mnc=0 mnc_3_digits=0 pass
+12: "23 " rc=-22 mnc=0 mnc_3_digits=0 pass
+13: " 023" rc=-22 mnc=0 mnc_3_digits=0 pass
+14: "023 " rc=-22 mnc=0 mnc_3_digits=0 pass
+15: "023 " rc=-22 mnc=0 mnc_3_digits=0 pass