imap: check buffer length before accessing it #19887
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Pointed out by ZeroPath
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Pull request overview
This PR adds a buffer length check before accessing buffer data at an offset in the IMAP SELECT response handler. The change prevents potential out-of-bounds memory access when parsing UIDVALIDITY responses from IMAP servers by verifying the buffer length before accessing line[2]. This is a security fix pointed out by ZeroPath.
Key Changes:
- Moved buffer pointer and length retrieval to be scoped within the condition where they're used
- Added length check (
len > 2) before accessing buffer at offset 2
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Pointed out by ZeroPath