Am 24.06.2014 22:05, schrieb Paul Gortmaker: > We see the following on a 32bit gcc installed on 64 bit host: > > Reading symbols from ./i586-pokymllib32-linux-gcc...done. > (gdb) run > Starting program: > x86-pokymllib32-linux/lib32-gcc/4.9.0-r0/image/usr/bin/i586-pokymllib32-linux-gcc > > Program received signal SIGSEGV, Segmentation fault. > 0xf7e957e0 in free () from /lib/i386-linux-gnu/libc.so.6 > (gdb) bt > #0 0xf7e957e0 in free () from /lib/i386-linux-gnu/libc.so.6 > #1 0x0804b73c in set_multilib_dir () at gcc-4.9.0/gcc/gcc.c:7827 > #2 main (argc=1, argv=0xffffd504) at gcc-4.9.0/gcc/gcc.c:6688 > (gdb) > > The problem arises because we conditionally assign the pointer we > eventually free, and the conditional may assign the pointer to the > non-malloc'd internal string "." which fails when we free it here: > > if (multilib_dir == NULL && multilib_os_dir != NULL > && strcmp (multilib_os_dir, ".") == 0) > { > free (CONST_CAST (char *, multilib_os_dir)); > ... > > As suggested by Jakub, ensure the "." case is also malloc'd via > xstrdup() and hence the pointer for the "." case can be freed.
I tested the very same test and didn't find any issues. This should go to the trunk and the active branches (but I cannot approve it). Matthias