[syslinux:master] localboot: Clear register image before using

[syslinux-bot for H. Peter Anvin]

Commit-ID:  f775e740a3a817a4ff5ba26bea99dbfd735456b3
Gitweb:     http://www.syslinux.org/commit/f775e740a3a817a4ff5ba26bea99dbfd735456b3
Author:     H. Peter Anvin <hpa at linux.intel.com>
AuthorDate: Tue, 21 Jan 2014 07:15:52 -0800
Committer:  H. Peter Anvin <hpa at linux.intel.com>
CommitDate: Tue, 21 Jan 2014 07:18:41 -0800

localboot: Clear register image before using

Using a register image on the stack without initializing it is not a
good idea.

Reported-by: Erwan Velu <erwanaliasr1 at gmail.com>
Signed-off-by: H. Peter Anvin <hpa at linux.intel.com>

---
 core/localboot.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/localboot.c b/core/localboot.c
index 0f4b582..b68d3f2 100644
--- a/core/localboot.c
+++ b/core/localboot.c
@@ -57,6 +57,7 @@ __export void local_boot(int16_t ax)
 	 * Load boot sector from the specified BIOS device and jump to
 	 * it.
 	 */
+	memset(&ireg, 0, sizeof ireg);
 	ireg.edx.b[0] = ax & 0xff;
 	ireg.eax.w[0] = 0;	/* Reset drive */
 	__intcall(0x13, &ireg, NULL);