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hw/ppc/e500.c: Handle qemu_find_file() failure

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If qemu_find_file() doesn't find the BIOS it returns NULL; we were
passing that unchecked through to load_elf(), which assumes a non-NULL
pointer and may misbehave. In practice it fails with a weird message:

  $ qemu-system-ppc -M ppce500 -display none -kernel nonesuch
  Bad address
  qemu-system-ppc: could not load firmware '(null)'

Handle the failure case better:

  $ qemu-system-ppc -M ppce500 -display none -kernel nonesuch
  qemu-system-ppc: could not find firmware/kernel file 'nonesuch'

Spotted by Coverity (CID 1238954).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200324121216.23899-1-peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Peter Maydell 2020-03-24 12:12:16 +00:00 committed by David Gibson
parent 53ef8a92eb
commit 3b4f50bd7d
1 changed files with 4 additions and 0 deletions
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hw/ppc/e500.c
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@ -1047,6 +1047,10 @@ void ppce500_init(MachineState *machine)
}
filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, payload_name);
if (!filename) {
error_report("could not find firmware/kernel file '%s'", payload_name);
exit(1);
}
payload_size = load_elf(filename, NULL, NULL, NULL,
&bios_entry, &loadaddr, NULL, NULL,