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[text_sensor] Fix infinite loop in substitute filter (#11989)

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Co-authored-by: J. Nick Koston <nick@koston.org>
This commit is contained in:
Jonathan Swoboda
2025-11-19 10:12:34 -05:00
committed by GitHub
parent 100ea46f03
commit f2b10ad132
1 changed files with 6 additions and 2 deletions
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esphome/components/text_sensor/filter.cpp
+6 -2
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@@ -66,10 +66,14 @@ SubstituteFilter::SubstituteFilter(const std::initializer_list<Substitution> &su
: substitutions_(substitutions) {} : substitutions_(substitutions) {}
optional<std::string> SubstituteFilter::new_value(std::string value) { optional<std::string> SubstituteFilter::new_value(std::string value) {
std::size_t pos;
for (const auto &sub : this->substitutions_) { for (const auto &sub : this->substitutions_) {
while ((pos = value.find(sub.from)) != std::string::npos) std::size_t pos = 0;
while ((pos = value.find(sub.from, pos)) != std::string::npos) {
value.replace(pos, sub.from.size(), sub.to); value.replace(pos, sub.from.size(), sub.to);
// Advance past the replacement to avoid infinite loop when
// the replacement contains the search pattern (e.g., f -> foo)
pos += sub.to.size();
}
} }
return value; return value;
} }