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Date: Mon, 9 May 2011 16:32:41 +0200 (CEST) From: Julia Lawall <julia@...u.dk> To: Vladimir Motyka <vladimir.motyka@...il.com> Cc: cjb@...top.org, kernel-janitors@...r.kernel.org, linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] drivers/mmc/card/block.c: fix potential null dereference 'idata' On Mon, 9 May 2011, Vladimir Motyka wrote: > When allocation of idata fails there was a null dereferece. Why not have a different label for the two cases? That would make the code easier to statically analyze, and perhaps be more understandable as well. julia > Signed-off-by: Vladimir Motyka <vladimir.motyka@...il.com> > > --- > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c > index 407836d..3dec493 100644 > --- a/drivers/mmc/card/block.c > +++ b/drivers/mmc/card/block.c > @@ -266,10 +266,10 @@ static struct mmc_blk_ioc_data > *mmc_blk_ioctl_copy_from_user( > return idata; > > copy_err: > - kfree(idata->buf); > + if(idata) > + kfree(idata->buf); > kfree(idata); > return ERR_PTR(err); > - > } > > static int mmc_blk_ioctl_cmd(struct block_device *bdev, > -- > To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- 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/
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