output/httpd/IcyMetaDataServer: cast length to unsigned

Fixes another buffer overflow: if the stream has a very long title or URL, resulting in a metadata string of more than 2 kB, icy_string[0] is a negative value, which gets casted to size_t - ouch! https://bugs.musicpd.org/view.php?id=4652

output/httpd/IcyMetaDataServer: cast length to unsigned
4bb83781 · Max Kellermann · a73195b7 · 4bb83781 · 4bb83781
Commit 4bb83781 authored Feb 19, 2017 by Max Kellermann
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NEWS NEWS +2 -0

IcyMetaDataServer.cxx src/output/plugins/httpd/IcyMetaDataServer.cxx +1 -1

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--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,8 @@ ver 0.20.5 (not yet released)
  - id3: fix memory leak on corrupt ID3 tags
 * decoder
  - sidplay: don't require libsidutils when building with libsidplayfp
+* output
+  - httpd: fix two buffer overflows in IcyMetaData length calculation
 * mixer
  - alsa: fix crash bug

--- a/src/output/plugins/httpd/IcyMetaDataServer.cxx
+++ b/src/output/plugins/httpd/IcyMetaDataServer.cxx
@@ -113,5 +113,5 @@ icy_server_metadata_page(const Tag &tag, const TagType *types)
 	if (icy_string.IsNull())
 		return nullptr;
-	return Page::Copy(icy_string.c_str(), (icy_string[0] * 16) + 1);
+	return Page::Copy(icy_string.c_str(), uint8_t(icy_string[0]) * 16 + 1);
 }