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added return value check of snprintf to prevent possible buffer overflows detected by CodeQL

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This commit is contained in:
weichslgartner
2022-06-20 19:22:11 +02:00
parent eb2b38790a
commit ef853f5553
1 changed files with 28 additions and 7 deletions
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lib.c
+28 -7
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@@ -568,10 +568,20 @@ static int snprintf_error_data(char *buf, size_t len, uint8_t err,
for (i = 0; i < arr_len; i++) {
if (err & (1 << i)) {
if (count)
n += snprintf(buf + n, len - n, ",");
n += snprintf(buf + n, len - n, "%s", arr[i]);
count++;
int tmp_n = 0;
if (count){
/* Fix for potential buffer overflow https://lgtm.com/rules/1505913226124/ */
tmp_n = snprintf(buf + n, len - n, ",");
if (tmp_n < 0 || tmp_n >= len - n){
return n;
}
n += tmp_n;
}
tmp_n = snprintf(buf + n, len - n, "%s", arr[i]);
if (tmp_n < 0 || tmp_n >= len - n){
return n;
}
n += tmp_n;
}
}
@@ -644,9 +654,20 @@ void snprintf_can_error_frame(char *buf, size_t len, const struct canfd_frame *c
for (i = 0; i < (int)ARRAY_SIZE(error_classes); i++) {
mask = 1 << i;
if (class & mask) {
if (classes)
n += snprintf(buf + n, len - n, "%s", sep);
n += snprintf(buf + n, len - n, "%s", error_classes[i]);
int tmp_n = 0;
if (classes){
/* Fix for potential buffer overflow https://lgtm.com/rules/1505913226124/ */
tmp_n = snprintf(buf + n, len - n, "%s", sep);
if (tmp_n < 0 || tmp_n >= len - n){
return;
}
n += tmp_n;
}
tmp_n = snprintf(buf + n, len - n, "%s", error_classes[i]);
if (tmp_n < 0 || tmp_n >= len - n){
return;
}
n += tmp_n;
if (mask == CAN_ERR_LOSTARB)
n += snprintf_error_lostarb(buf + n, len - n,
cf);