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From: Daniel Hazelton <dhazelton@enter.net>
To: Jiri Kosina <jkosina@suse.cz>
Cc: Jan Kara <jack@suse.cz>,
	Andrew Morton <akpm@linux-foundation.org>,
	Nix <nix@esperi.org.uk>, Peter Osterlund <petero2@telia.com>,
	linux-kernel@vger.kernel.org, dm-devel@redhat.com,
	Jan Kara <jack@ucw.cz>
Subject: Re: 2.6.24.2: 4KSTACKS + pcdrw + dm + mount -> stack overflow: ide-cd related? dm-related?
Date: Tue, 26 Feb 2008 12:25:41 -0500	[thread overview]
Message-ID: <200802261225.41724.dhazelton@enter.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0802261207140.30955@jikos.suse.cz>

On Tuesday 26 February 2008 06:10:34 Jiri Kosina wrote:
> On Mon, 25 Feb 2008, Jan Kara wrote:
> >   Yes, exactly two of them. One is  non-trivial to get rid of - it's
> > used for encoding of filename before we write it,
>
> Why can't we do just
>
>
>
> UDF: Optimize stack usage
>
> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
>
> diff --git a/fs/udf/namei.c b/fs/udf/namei.c
> index 112a5fb..706a2b5 100644
> --- a/fs/udf/namei.c
> +++ b/fs/udf/namei.c
> @@ -336,7 +336,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode
> *dir, {
>  	struct super_block *sb = dir->i_sb;
>  	struct fileIdentDesc *fi = NULL;
> -	char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
> +	char *name, *fname;
>  	int namelen;
>  	loff_t f_pos;
>  	int flen;
> @@ -352,6 +352,14 @@ static struct fileIdentDesc *udf_add_entry(struct
> inode *dir, struct extent_position epos = {};
>  	struct udf_inode_info *dinfo;
>
> +	name = kmalloc(sizeof(char) * UDF_NAME_LEN, GFP_KERNEL);
> +	fname = kmalloc(sizeof(char) * UDF_NAME_LEN, GFP_KERNEL);
> +
> +	if (!name || !fname) {
> +		*err = -ENOMEM;
> +		return NULL;
> +	}
> +

Wouldn't it be better to check each individually, so you do wind up leaking a 
buffer here if one gets allocated and the other doesn't ?

>  	if (dentry) {
>  		if (!dentry->d_name.len) {
>  			*err = -EINVAL;
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index f3ac4ab..42e3ba8 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -1345,7 +1345,7 @@ static void udf_load_logicalvolint(struct super_block
> *sb, kernel_extent_ad loc) *	July 1, 1997 - Andrew E. Mileski
>   *	Written, tested, and released.
>   */
> -static int udf_process_sequence(struct super_block *sb, long block,
> +static int noinline udf_process_sequence(struct super_block *sb, long
> block, long lastblock, kernel_lb_addr *fileset)
>  {
>  	struct buffer_head *bh = NULL;
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

DRH

-- 
Dialup is like pissing through a pipette. Slow and excruciatingly painful.

  parent reply	other threads:[~2008-02-26 17:26 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-24  1:56 2.6.24.2: 4KSTACKS + PCA403CD IDE CD + pcdrw + mount + PREEMPT -> stack overflow Nix
2008-02-24 15:59 ` 2.6.24.2: 4KSTACKS + pcdrw + dm + mount -> stack overflow: ide-cd related? dm-related? Nix
2008-02-24 16:56   ` Peter Osterlund
2008-02-24 17:02     ` Nix
2008-02-25 20:30       ` Andrew Morton
2008-02-25 22:48         ` Jan Kara
2008-02-25 22:51           ` Andrew Morton
2008-02-26 11:10           ` Jiri Kosina
2008-02-26 11:29             ` Ingo Molnar
2008-02-26 11:37               ` Jiri Kosina
2008-02-26 16:41                 ` Jan Kara
2008-02-26 17:25             ` Daniel Hazelton [this message]
2008-03-06 16:14       ` Jan Kara
2008-03-10 20:09         ` Nix
2008-02-25 20:25     ` Andrew Morton

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