Re: Slab corruption in 2.6.16-rc5-mm2

[Linus Torvalds <torvalds@osdl.org>]

On Mon, 6 Mar 2006, Jesper Juhl wrote:
> 
> Hmm, is it just me or should that len= have read len=96 ???
> 
> This is the change I made :
> 
> --- linux-2.6.16-rc5-mm2/block/scsi_ioctl.c~    2006-03-06
> 21:43:56.000000000 +0100
> +++ linux-2.6.16-rc5-mm2/block/scsi_ioctl.c     2006-03-06
> 21:43:56.000000000 +0100
> @@ -568,7 +568,7 @@ int scsi_cmd_ioctl(struct file *file, st
>                         hdr.dxferp = cgc.buffer;
>                         hdr.sbp = cgc.sense;
>                         if (hdr.sbp)
> -                               hdr.mx_sb_len = sizeof(struct request_sense);
> +                               hdr.mx_sb_len = SCSI_SENSE_BUFFERSIZE;
>                         hdr.timeout = cgc.timeout;
>                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
>                         hdr.cmd_len = sizeof(cgc.cmd);
> 
> did I mess up?

That's not the one to change. It's the one in "sr_do_ioctl()", where it 
uses "sizeof(*sense)".

		Linus

----
diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index 5d02ff4..b65462f 100644
--- a/drivers/scsi/sr_ioctl.c
+++ b/drivers/scsi/sr_ioctl.c
@@ -192,7 +192,7 @@ int sr_do_ioctl(Scsi_CD *cd, struct pack
 	SDev = cd->device;
 
 	if (!sense) {
-		sense = kmalloc(sizeof(*sense), GFP_KERNEL);
+		sense = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
 		if (!sense) {
 			err = -ENOMEM;
 			goto out;
-
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