linux-kernel - [PATCH 5/9] video: Less function calls in trident_pci

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 19 Jan 2015 19:38:08 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 5/9] video: Less function calls in trident_pci_probe() after
 error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Mon, 19 Jan 2015 14:18:47 +0100

The functions "iounmap" and "kfree" could be called in a few cases by the
trident_pci_probe() function during error handling even if the passed data
structure element contained still a null pointer.

This implementation detail could be improved by adjustments for jump labels.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/video/fbdev/tridentfb.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/video/fbdev/tridentfb.c b/drivers/video/fbdev/tridentfb.c
index 71567401..86d4733 100644
--- a/drivers/video/fbdev/tridentfb.c
+++ b/drivers/video/fbdev/tridentfb.c
@@ -1436,7 +1436,7 @@ static int trident_pci_probe(struct pci_dev *dev,
 	if (!default_par->io_virt) {
 		debug("ioremap failed\n");
 		err = -1;
-		goto out_unmap1;
+		goto release_memory_region_mmio;
 	}
 
 	enable_mmio(default_par);
@@ -1459,7 +1459,7 @@ static int trident_pci_probe(struct pci_dev *dev,
 	if (!info->screen_base) {
 		debug("ioremap failed\n");
 		err = -1;
-		goto out_unmap2;
+		goto release_memory_region_smem;
 	}
 
 	default_par->flatpanel = is_flatpanel(default_par);
@@ -1485,7 +1485,7 @@ static int trident_pci_probe(struct pci_dev *dev,
 	info->pixmap.addr = kmalloc(4096, GFP_KERNEL);
 	if (!info->pixmap.addr) {
 		err = -ENOMEM;
-		goto out_unmap2;
+		goto io_unmap_screenbase;
 	}
 
 	info->pixmap.size = 4096;
@@ -1531,11 +1531,14 @@ static int trident_pci_probe(struct pci_dev *dev,
 
 out_unmap2:
 	kfree(info->pixmap.addr);
+io_unmap_screenbase:
 	iounmap(info->screen_base);
+release_memory_region_smem:
 	release_mem_region(tridentfb_fix.smem_start, tridentfb_fix.smem_len);
 	disable_mmio(info->par);
 out_unmap1:
 	iounmap(default_par->io_virt);
+release_memory_region_mmio:
 	release_mem_region(tridentfb_fix.mmio_start, tridentfb_fix.mmio_len);
 	framebuffer_release(info);
 	return err;
-- 
2.2.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/