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-rw-r--r--erts/emulator/beam/erl_nif.c49
1 files changed, 25 insertions, 24 deletions
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 8342070521..3ade17b10d 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -3426,36 +3426,38 @@ static int examine_iovec_term(Eterm list, UWord max_length, iovec_slice_t *resul
size = binary_size(binary);
binary_header = binary_val(binary);
- /* If we're a sub-binary we'll need to check our underlying binary to
- * determine whether we're on-heap or not. */
- if(thing_subtag(*binary_header) == SUB_BINARY_SUBTAG) {
- ErlSubBin *sb = (ErlSubBin*)binary_header;
-
- /* Reject bitstrings */
- if((sb->bitoffs + sb->bitsize) > 0) {
- return 0;
+ if (size > 0) {
+ /* If we're a sub-binary we'll need to check our underlying binary
+ * to determine whether we're on-heap or not. */
+ if (thing_subtag(*binary_header) == SUB_BINARY_SUBTAG) {
+ ErlSubBin *sb = (ErlSubBin*)binary_header;
+
+ /* Reject bitstrings */
+ if((sb->bitoffs + sb->bitsize) > 0) {
+ return 0;
+ }
+
+ ASSERT(size <= binary_size(sb->orig));
+ binary_header = binary_val(sb->orig);
}
- ASSERT(size <= binary_size(sb->orig));
- binary_header = binary_val(sb->orig);
- }
-
- if(thing_subtag(*binary_header) == HEAP_BINARY_SUBTAG) {
- ASSERT(size <= ERL_ONHEAP_BIN_LIMIT);
+ if (thing_subtag(*binary_header) == HEAP_BINARY_SUBTAG) {
+ ASSERT(size <= ERL_ONHEAP_BIN_LIMIT);
- result->iovec_len += 1;
- result->onheap_size += size;
- } else {
- ASSERT(thing_subtag(*binary_header) == REFC_BINARY_SUBTAG);
+ result->iovec_len += 1;
+ result->onheap_size += size;
+ } else {
+ ASSERT(thing_subtag(*binary_header) == REFC_BINARY_SUBTAG);
- result->iovec_len += 1 + size / MAX_SYSIOVEC_IOVLEN;
- result->offheap_size += size;
+ result->iovec_len += 1 + size / MAX_SYSIOVEC_IOVLEN;
+ result->offheap_size += size;
+ }
}
result->sublist_length += 1;
lookahead = CDR(cell);
- if(result->sublist_length >= max_length) {
+ if (result->sublist_length >= max_length) {
break;
}
}
@@ -3535,7 +3537,7 @@ static int fill_iovec_with_slice(ErlNifEnv *env,
/* If this isn't a refc binary, copy its contents to the onheap buffer
* and reference that instead. */
- if (raw_data.ref_bin == NULL) {
+ if (raw_data.size > 0 && raw_data.ref_bin == NULL) {
ASSERT(onheap_offset < onheap_data.size);
ASSERT(slice->onheap_size > 0);
@@ -3546,12 +3548,11 @@ static int fill_iovec_with_slice(ErlNifEnv *env,
raw_data.ref_bin = onheap_data.ref_bin;
}
- ASSERT(raw_data.ref_bin != NULL);
-
while (raw_data.size > 0) {
UWord chunk_len = MIN(raw_data.size, MAX_SYSIOVEC_IOVLEN);
ASSERT(iovec_idx < iovec->iovcnt);
+ ASSERT(raw_data.ref_bin != NULL);
iovec->iov[iovec_idx].iov_base = raw_data.data;
iovec->iov[iovec_idx].iov_len = chunk_len;