> On Sun, Jan 25, 2009 at 9:45 PM, Eric Sandeen <sandeen@xxxxxxxxxx> wrote: > > Manish Katiyar wrote: > >> On Tue, Jan 20, 2009 at 10:36 PM, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote: > >>> ext2_quota_read doesn't bzeroes tmp_bh before calling ext2_get_block() > >>> where we access the b_size of it. Since it is a local variable it > >>> might contain some garbage. Make sure it is filled with zero before > >>> passing. > >> > >> Hi Ted/mingming, > >> > >> Any feedback on this ?? > > > > This looks ok to me, Manish. I'm curious, did you see this fail in real > > life, and if so, what'd the failure look like? > > Actually no......I realised this while going through the code. I was > also wondering why we haven't hit this till now. Since ext{3,4} don't > have this issue, the only reason I can think of is because ext2 with > quota is not very much used or somehow we are lucky. Well, I think ext2 with quotas is not used very often. But also note that if a random garbage is passed in it has high chances that maxblocks is >= 1. And that is all what is needed for ext2_get_blocks() to return what we want. Honza -- Jan Kara <jack@xxxxxxx> SuSE CR Labs -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html