[PATCH] DAC960 oops fix

ioctl_by_bdev() passes in a NULL file*, so we had better not dereference it.

[PATCH] DAC960 oops fix
ioctl_by_bdev() passes in a NULL file*, so we had better not dereference it.
2685d137 · Andrew Morton · Linus Torvalds · c6c9afeb · 2685d137
Commit 2685d137 authored May 18, 2003 by Andrew Morton Committed by Linus Torvalds May 18, 2003
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drivers/block/DAC960.c drivers/block/DAC960.c +1 -1

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--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -102,7 +102,7 @@ static int DAC960_ioctl(struct inode *inode, struct file *file,
 	int drive_nr = (int)disk->private_data;
 	struct hd_geometry g, *loc = (struct hd_geometry *)arg;
-	if (file->f_flags & O_NONBLOCK)
+	if (file && (file->f_flags & O_NONBLOCK))
 		return DAC960_UserIOCTL(inode, file, cmd, arg);
 	if (cmd != HDIO_GETGEO || !loc)