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bufio: mention that panic at slicing means underlying reader is broken

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Fixes #49795

Change-Id: I2b4fd14f0ed36b643522559bebf5ce52b1d7b304
Reviewed-on: https://go-review.googlesource.com/c/go/+/367214
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Keith Randall 2021-11-26 07:36:09 -08:00
parent bf88adadac
commit 1d47a1184a
1 changed files with 2 additions and 0 deletions
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2
src/bufio/bufio.go
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@ -244,6 +244,8 @@ func (b *Reader) Read(p []byte) (n int, err error) {
} }
// copy as much as we can // copy as much as we can
// Note: if the slice panics here, it is probably because
// the underlying reader returned a bad count. See issue 49795.
n = copy(p, b.buf[b.r:b.w]) n = copy(p, b.buf[b.r:b.w])
b.r += n b.r += n
b.lastByte = int(b.buf[b.r-1]) b.lastByte = int(b.buf[b.r-1])