Add length check in Doc::data_len()#13133
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Pull request overview
This PR adds a defensive length check to Doc::data_len() in the cache layer so malformed Doc::len / hlen combinations no longer underflow when computing payload length.
Changes:
- Add a guard in
Doc::data_len()to return0when the fragment length is not large enough to contain theDocprefix plus header. - Preserve the existing payload-length computation for valid cache documents.
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| if (this->len <= sizeof(self_type) + this->hlen) { | ||
| return 0; | ||
| } | ||
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| return this->len - sizeof(self_type) - this->hlen; |
Comment on lines
+85
to
89
| if (this->len <= sizeof(self_type) + this->hlen) { | ||
| return 0; | ||
| } | ||
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| return this->len - sizeof(self_type) - this->hlen; |
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To avoid underflow.