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Date: Sun, 3 Feb 2019 19:02:38 +0100
From: Patrick Steinhardt <ps@....im>
To: musl@...ts.openwall.com
Cc: Rich Felker <dalias@...ifal.cx>
Subject: freeaddrinfo(NULL) segfaults in v1.1.21
Hi,
previous to v1.1.21 it was fine to call `freeaddrinfo(NULL)`, as
the implementation simply called `free(NULL)` in that case. Since
commit d1395c43 (allow freeaddrinfo of arbitrary sublists of
addrinfo list, 2018-10-04), this is no longer the case, as musl
now tries always de-references the passed pointer to free
potential sublists.
As long as I didn't miss it, freeaddrinfo(3P) doesn't explicitly
say whether it needs to be called with a valid pointer, and sure
enough there's applications out there which aren't careful here.
One example I found is e.g. nfs-utils, where I hit segfaults in
different places after upgrading to musl v1.1.21.
So was this change in behavior intended or is it an unwanted
side-effect of the commit in question?
Patrick
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