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#951 - fix unchecked count in cfun_buffer_new_filled

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This commit is contained in:
rick2600 2022-04-14 16:20:04 -03:00
parent a964b164a6
commit d5a5c49357
1 changed files with 2 additions and 1 deletions
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3
src/core/buffer.c
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@ -178,12 +178,13 @@ JANET_CORE_FN(cfun_buffer_new_filled,
"Returns the new buffer.") { "Returns the new buffer.") {
janet_arity(argc, 1, 2); janet_arity(argc, 1, 2);
int32_t count = janet_getinteger(argv, 0); int32_t count = janet_getinteger(argv, 0);
if (count < 0) count = 0;
int32_t byte = 0; int32_t byte = 0;
if (argc == 2) { if (argc == 2) {
byte = janet_getinteger(argv, 1) & 0xFF; byte = janet_getinteger(argv, 1) & 0xFF;
} }
JanetBuffer *buffer = janet_buffer(count); JanetBuffer *buffer = janet_buffer(count);
if (buffer->data) if (buffer->data && count > 0)
memset(buffer->data, byte, count); memset(buffer->data, byte, count);
buffer->count = count; buffer->count = count;
return janet_wrap_buffer(buffer); return janet_wrap_buffer(buffer);