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POSIX requires getdelim()/getline() to allocate a new buffer whenever *lineptr is NULL, regardless of the value of *n. The previous code read the buffer size from *n unconditionally and only fell back to the initial size when *n was zero, so a caller that passes *lineptr == NULL together with an uninitialized (non-zero) *n caused lib_malloc() to be invoked with that garbage size and typically fail with ENOMEM. Treat a NULL *lineptr the same as a zero *n: (re)allocate from the known BUFSIZE_INIT and ignore the untrusted *n. This matches the glibc behaviour that portable code relies on (for example toybox grep, which calls getdelim() with an uninitialized size variable). Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> |
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