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Stefan Hajnoczi authored
Check if the backend option is missing before searching the backend table. This fixes a NULL pointer dereference when QEMU is invoked with the following invalid command-line: $ qemu -chardev id=foo,path=/tmp/socket Previously QEMU would segfault, now it produces this error message: chardev: "foo" missing backend Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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