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readline: don't free completions in readline_free()

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Since commit e5dc1a6c6c, QEMU aborts on exit if completion was used
in the monitor:

*** Error in `obj/ppc64-softmmu/qemu-system-ppc64': double free or
 corruption (fasttop): 0x00000100331069d0 ***

 /home/greg/Work/qemu/qemu-spapr/util/readline.c:514
 /home/greg/Work/qemu/qemu-spapr/monitor.c:586
 /home/greg/Work/qemu/qemu-spapr/monitor.c:4125
 argv=<optimized out>, envp=<optimized out>) at
 /home/greg/Work/qemu/qemu-spapr/vl.c:4795

Completion strings are not persistent accross completions (why would
they?). They are allocated under readline_completion(), which already
takes care of freeing them before returning.

Maybe all completion related bits should be moved out of ReadLineState
to a dedicated structure ?

In the meantime, let's drop the offending lines from readline_free()
to fix the crash.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <151627206353.4505.4602428849861610759.stgit@bahia.lan>
Fixes: e5dc1a6c6c
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Greg Kurz 2018-01-18 11:41:03 +01:00 committed by Paolo Bonzini
parent 4e4b57342e
commit 4183e2ea6d
1 changed files with 0 additions and 3 deletions
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3
util/readline.c
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@ -510,9 +510,6 @@ void readline_free(ReadLineState *rs)
for (i = 0; i < READLINE_MAX_CMDS; i++) {
g_free(rs->history[i]);
}
for (i = 0; i < READLINE_MAX_COMPLETIONS; i++) {
g_free(rs->completions[i]);
}
g_free(rs);
}