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base: fix bug in String::valid()

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String::valid() does not check whether _length is zero.
Consequently, this leads to _buf[-1] being evaluated.
This commit is contained in:
Johannes Schlatow 2014-03-26 18:53:39 +01:00 committed by Christian Helmuth
parent e6c7596af5
commit 2262eb8347
1 changed files with 1 additions and 1 deletions
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base/include/util/string.h
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@ -479,7 +479,7 @@ namespace Genode {
static constexpr size_t capacity() { return CAPACITY; }
bool valid() const {
return (_length <= CAPACITY) && (_buf[_length - 1] == '\0'); }
return (_length <= CAPACITY) && (_length != 0) && (_buf[_length - 1] == '\0'); }
char const *string() const { return valid() ? _buf : ""; }