[PATCH] pcmcia Oopses fixes

Fix some NULL dereferences in the pcmcia code when using old userland
tools.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/pcmcia/pcmcia_ioctl.c b/drivers/pcmcia/pcmcia_ioctl.c
index c53db7c..738b1ef 100644 (file)
--- a/drivers/pcmcia/pcmcia_ioctl.c
+++ b/drivers/pcmcia/pcmcia_ioctl.c
@@ -426,7 +426,7 @@ static int ds_open(struct inode *inode, struct file *file)
 
     if (!warning_printed) {
            printk(KERN_INFO "pcmcia: Detected deprecated PCMCIA ioctl "
-                       "usage.\n");
+                       "usage from process: %s.\n", current->comm);
            printk(KERN_INFO "pcmcia: This interface will soon be removed from "
                        "the kernel; please expect breakage unless you upgrade "
                        "to new tools.\n");
@@ -601,8 +601,12 @@ static int ds_ioctl(struct inode * inode, struct file * file,
            ret = CS_BAD_ARGS;
        else {
            struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->config.Function);
-           ret = pccard_get_configuration_info(s, p_dev, &buf->config);
-           pcmcia_put_dev(p_dev);
+           if (p_dev == NULL)
+                   ret = CS_BAD_ARGS;
+           else {
+                   ret = pccard_get_configuration_info(s, p_dev, &buf->config);
+                   pcmcia_put_dev(p_dev);
+           }
        }
        break;
     case DS_GET_FIRST_TUPLE:
@@ -632,8 +636,12 @@ static int ds_ioctl(struct inode * inode, struct file * file,
                    ret = CS_BAD_ARGS;
            else {
                    struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->status.Function);
-                   ret = pccard_get_status(s, p_dev, &buf->status);
-                   pcmcia_put_dev(p_dev);
+                   if (p_dev == NULL)
+                           ret = CS_BAD_ARGS;
+                   else {
+                           ret = pccard_get_status(s, p_dev, &buf->status);
+                           pcmcia_put_dev(p_dev);
+                   }
            }
            break;
     case DS_VALIDATE_CIS:
@@ -665,9 +673,10 @@ static int ds_ioctl(struct inode * inode, struct file * file,
        if (!(buf->conf_reg.Function &&
             (buf->conf_reg.Function >= s->functions))) {
                struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->conf_reg.Function);
-               if (p_dev)
+               if (p_dev) {
                        ret = pcmcia_access_configuration_register(p_dev, &buf->conf_reg);
-               pcmcia_put_dev(p_dev);
+                       pcmcia_put_dev(p_dev);
+               }
        }
        break;
     case DS_GET_FIRST_REGION: