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Merged
merged 2 commits into from
Jan 17, 2018
Merged

buffer: throw when filling with empty buffers #18129

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1e80253
buffer: throw when filling with empty buffers
cjihrig Jan 13, 2018
dbdcf12
doc: correct buffer changelog ordering
cjihrig Jan 17, 2018
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22 changes: 15 additions & 7 deletions doc/api/buffer.md
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Original file line number Diff line number Diff line change
Expand Up @@ -511,14 +511,18 @@ console.log(buf2.toString());
<!-- YAML
added: v5.10.0
changes:
- version: v8.9.3
pr-url: https://github.com/nodejs/node/pull/17428
description: Specifying an invalid string for `fill` now results in a
zero-filled buffer.
- version: REPLACEME
pr-url: https://github.com/nodejs/node/pull/18129
description: Attempting to fill a non-zero length buffer with a zero length
buffer triggers a thrown exception.
- version: REPLACEME
pr-url: https://github.com/nodejs/node/pull/17427
description: Specifying an invalid string for `fill` triggers a thrown
exception.
- version: v8.9.3
pr-url: https://github.com/nodejs/node/pull/17428
description: Specifying an invalid string for `fill` now results in a
zero-filled buffer.
-->

* `size` {integer} The desired length of the new `Buffer`.
Expand Down Expand Up @@ -1224,13 +1228,17 @@ console.log(buf1.equals(buf3));
<!-- YAML
added: v0.5.0
changes:
- version: v5.7.0
pr-url: https://github.com/nodejs/node/pull/4935
description: The `encoding` parameter is supported now.
- version: REPLACEME
pr-url: https://github.com/nodejs/node/pull/18129
description: Attempting to fill a non-zero length buffer with a zero length
buffer triggers a thrown exception.
- version: REPLACEME
pr-url: https://github.com/nodejs/node/pull/17427
description: Specifying an invalid string for `value` triggers a thrown
exception.
- version: v5.7.0
pr-url: https://github.com/nodejs/node/pull/4935
description: The `encoding` parameter is supported now.
-->

* `value` {string|Buffer|integer} The value to fill `buf` with.
Expand Down
14 changes: 7 additions & 7 deletions src/node_buffer.cc
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Expand Up @@ -642,20 +642,20 @@ void Fill(const FunctionCallbackInfo<Value>& args) {
str_obj,
enc,
nullptr);
// This check is also needed in case Write() returns that no bytes could
// be written. If no bytes could be written, then return -1 because the
// string is invalid. This will trigger a throw in JavaScript. Silently
// failing should be avoided because it can lead to buffers with unexpected
// contents.
if (str_length == 0)
return args.GetReturnValue().Set(-1);
}

start_fill:

if (str_length >= fill_length)
return;

// If str_length is zero, then either an empty buffer was provided, or Write()
// indicated that no bytes could be written. If no bytes could be written,
// then return -1 because the fill value is invalid. This will trigger a throw
// in JavaScript. Silently failing should be avoided because it can lead to
// buffers with unexpected contents.
if (str_length == 0)
return args.GetReturnValue().Set(-1);

size_t in_there = str_length;
char* ptr = ts_obj_data + start + str_length;
Expand Down
7 changes: 7 additions & 0 deletions test/parallel/test-buffer-alloc.js
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Expand Up @@ -1024,3 +1024,10 @@ common.expectsError(() => {
code: 'ERR_INVALID_ARG_VALUE',
type: TypeError
});

common.expectsError(() => {
Buffer.alloc(1, Buffer.alloc(0));
}, {
code: 'ERR_INVALID_ARG_VALUE',
type: TypeError
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This issue seems to be everywhere ERR_INVALID_ARG_VALUE is used, so consider this non-blocking, but I'd think TypeError is the wrong error to use here. The type of the argument (Buffer) is fine. It's the value that's the problem. I think it should be vanilla Error or maybe RangeError.

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To your point, this PR uses the same error handling logic from #17427. In that PR, I was against using a TypeError for the same reasons you list here, but other collaborators felt differently.

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I think TypeError is fine here.

});