[Xen-devel] [PATCH]: xl: Fix NULL deref in libxl_ctx_free()

[Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>]

xc_interface_close() will de-reference a NULL handle, check for this
condition in libxl_ctx_free() before calling.

Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>

diff -r 245ea9337bb8 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c       Mon Sep 06 14:17:06 2010 +0100
+++ b/tools/libxl/libxl.c       Mon Sep 06 14:20:07 2010 +0100
@@ -67,7 +67,7 @@ int libxl_ctx_init(libxl_ctx *ctx, int v
 
 int libxl_ctx_free(libxl_ctx *ctx)
 {
-    xc_interface_close(ctx->xch);
+    if (ctx->xch) xc_interface_close(ctx->xch);
     libxl_version_info_destroy(&ctx->version_info);
     if (ctx->xsh) xs_daemon_close(ctx->xsh); 
     return 0;



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