linux-kernel - [tip:x86/urgent] x86/microcode: Fix double vfree() and remove redundant pointer checks before vfree()

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Message-ID: <tip-5cdd2de0a76d0ac47f107c8a7b32d75d25768dc1@git.kernel.org>
Date:	Mon, 27 Dec 2010 14:16:03 GMT
From:	tip-bot for Jesper Juhl <jj@...osbits.net>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	jj@...osbits.net, tigran@...azian.fsnet.co.uk,
	shaohua.li@...el.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/urgent] x86/microcode: Fix double vfree() and remove redundant pointer checks before vfree()

Commit-ID:  5cdd2de0a76d0ac47f107c8a7b32d75d25768dc1
Gitweb:     http://git.kernel.org/tip/5cdd2de0a76d0ac47f107c8a7b32d75d25768dc1
Author:     Jesper Juhl <jj@...osbits.net>
AuthorDate: Sat, 25 Dec 2010 19:57:41 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 27 Dec 2010 14:33:30 +0100

x86/microcode: Fix double vfree() and remove redundant pointer checks before vfree()

In arch/x86/kernel/microcode_intel.c::generic_load_microcode()
we have  this:

	while (leftover) {
		...
		if (get_ucode_data(mc, ucode_ptr, mc_size) ||
		    microcode_sanity_check(mc) < 0) {
			vfree(mc);
			break;
		}
		...
	}

	if (mc)
		vfree(mc);

This will cause a double free of 'mc'. This patch fixes that by
just  removing the vfree() call in the loop since 'mc' will be
freed nicely just  after we break out of the loop.

There's also a second change in the patch. I noticed a lot of
checks for  pointers being NULL before passing them to vfree().
That's completely  redundant since vfree() deals gracefully with
being passed a NULL pointer.  Removing the redundant checks
yields a nice size decrease for the object  file.

Size before the patch:
   text    data     bss     dec     hex filename
   4578     240    1032    5850    16da arch/x86/kernel/microcode_intel.o
Size after the patch:
   text    data     bss     dec     hex filename
   4489     240     984    5713    1651 arch/x86/kernel/microcode_intel.o

Signed-off-by: Jesper Juhl <jj@...osbits.net>
Acked-by: Tigran Aivazian <tigran@...azian.fsnet.co.uk>
Cc: Shaohua Li <shaohua.li@...el.com>
LKML-Reference: <alpine.LNX.2.00.1012251946100.10759@...mpdragon.chaosbits.net>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/microcode_intel.c |   16 +++++-----------
 1 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index dcb65cc..1a1b606 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -364,8 +364,7 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
 
 		/* For performance reasons, reuse mc area when possible */
 		if (!mc || mc_size > curr_mc_size) {
-			if (mc)
-				vfree(mc);
+			vfree(mc);
 			mc = vmalloc(mc_size);
 			if (!mc)
 				break;
@@ -374,13 +373,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
 
 		if (get_ucode_data(mc, ucode_ptr, mc_size) ||
 		    microcode_sanity_check(mc) < 0) {
-			vfree(mc);
 			break;
 		}
 
 		if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) {
-			if (new_mc)
-				vfree(new_mc);
+			vfree(new_mc);
 			new_rev = mc_header.rev;
 			new_mc  = mc;
 			mc = NULL;	/* trigger new vmalloc */
@@ -390,12 +387,10 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
 		leftover  -= mc_size;
 	}
 
-	if (mc)
-		vfree(mc);
+	vfree(mc);
 
 	if (leftover) {
-		if (new_mc)
-			vfree(new_mc);
+		vfree(new_mc);
 		state = UCODE_ERROR;
 		goto out;
 	}
@@ -405,8 +400,7 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
 		goto out;
 	}
 
-	if (uci->mc)
-		vfree(uci->mc);
+	vfree(uci->mc);
 	uci->mc = (struct microcode_intel *)new_mc;
 
 	pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
--
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