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pc: check for underflow in load_linux 

If (setup_size+1)*512 is small enough, kernel_size -= setup_size can allocate
a huge amount of memory.  Avoid that.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Paolo Bonzini 2015-09-14 12:07:22 +02:00 committed by Michael Tokarev
parent 16033ba577
commit ec5fd40264
1 changed files with 4 additions and 0 deletions
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4
hw/i386/pc.c
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@ -985,6 +985,10 @@ static void load_linux(PCMachineState *pcms,
setup_size = 4;
}
setup_size = (setup_size+1)*512;
if (setup_size > kernel_size) {
fprintf(stderr, "qemu: invalid kernel header\n");
exit(1);
}
kernel_size -= setup_size;
setup = g_malloc(setup_size);