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common: Avoid undefined behavior. 

* common/iobuf.c (iobuf_read_line): Do not consider 'length' if
'buffer' is NULL.

Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2017-03-30 15:44:35 +02:00
parent a6142dbdbc
commit 214fa90122
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1 changed files with 1 additions and 1 deletions
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common/iobuf.c
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@ -2552,7 +2552,7 @@ iobuf_read_line (iobuf_t a, byte ** addr_of_buffer,
NUL character in the buffer. This requires at least 2 bytes. We
don't complicate the code by handling the stupid corner case, but
simply assert that it can't happen. */
assert (length >= 2 || maxlen >= 2);
assert (!buffer || length >= 2 || maxlen >= 2);
if (!buffer || length <= 1)
/* must allocate a new buffer */