[Qemu-devel] [PATCH] pc_init: Fail on bad kernel

[Sasha Levin <levinsasha928@gmail.com>]

When providing QEMU with a bad '-kernel' parameter, such as a file which
is not really a kernel, QEMU will attempt to allocate a huge amount of
memory and fail either with "Failed to allocate memory: Cannot allocate
memory" or a GLib error: "GLib-ERROR **: gmem.c:170: failed to allocate
18446744073709529965 bytes"

This patch handles the case where the magic sig wasn't located in the
provided kernel, and loading it as multiboot failed as well.

Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
 hw/pc.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 6b3662e..428440b 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -691,8 +691,14 @@ static void load_linux(void *fw_cfg,
 	/* This looks like a multiboot kernel. If it is, let's stop
 	   treating it like a Linux kernel. */
         if (load_multiboot(fw_cfg, f, kernel_filename, initrd_filename,
-                           kernel_cmdline, kernel_size, header))
+                           kernel_cmdline, kernel_size, header)) {
             return;
+        } else {
+            fprintf(stderr, "qemu: could not load kernel '%s': %s\n",
+		    kernel_filename, strerror(errno));
+	    exit(1);
+        }
+	    
 	protocol = 0;
     }
 
-- 
1.7.6.1