build_SYS_str_reasons: Fix a crash caused by overlong locales
The 4 kB SPACE_SYS_STR_REASONS in crypto/err/err.c isn't enough for some locales. The Russian locales consume 6856 bytes, Ukrainian even 7000. build_SYS_str_reasons() contains an overflow check: if (cnt > sizeof(strerror_pool)) cnt = sizeof(strerror_pool); But since commit 9f15e5b911ba6053e09578f190354568e01c07d7 it no longer works as cnt is incremented once more after the condition. cnt greater than sizeof(strerror_pool) results in an unbounded OPENSSL_strlcpy() in openssl_strerror_r(), eventually causing a crash. When the first received error string was empty or contained only spaces, cur would move in front of the start of the strerror_pool. Also don't call openssl_strerror_r when the pool is full. Reviewed-by:Bernd Edlinger <bernd.edlinger@hotmail.de> Reviewed-by:
Richard Levitte <levitte@openssl.org> Reviewed-by:
Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/8966) (cherry picked from commit fac9200a881a83bef038ebed628ebd409786a1a6)
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