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    SubjectRe: [PATCH 5.4 000/168] 5.4.25-stable review
    On Tue, Mar 10, 2020 at 03:51:01PM +0100, Holger Hoffstätte wrote:
    > On 3/10/20 3:35 PM, Greg Kroah-Hartman wrote:
    > > On Tue, Mar 10, 2020 at 03:02:37PM +0100, Holger Hoffstätte wrote:
    > > > On 3/10/20 1:37 PM, Greg Kroah-Hartman wrote:
    > > > > This is the start of the stable review cycle for the 5.4.25 release.
    > > >
    > > > This fails to compile due to broken patch 001/168:
    > > > "block, bfq: get a ref to a group when adding it to a service tree":
    > > >
    > > > ..
    > > > block/bfq-wf2q.c: In function 'bfq_get_entity':
    > > > ./include/linux/kernel.h:994:51: error: 'struct bfq_group' has no member named 'entity'
    > > > ..
    > > >
    > > > The calls to bfq_get_entity::bfqg_and_blkg_get and bfq_forget_entity::bfqg_and_blkg_put
    > > > in bfq-wf2q.c need to be wrapped in #ifdef CONFIG_BFQ_GROUP_IOSCHED, otherwise
    > > > the build will fail when CONFIG_BFQ_GROUP_IOSCHED is not enabled.
    > > > This horribly error-prone #ifdef mess was finally removed in upstream commit
    > > > 4d8340d0d4d9. For 5.4 we'll either need that as well or add them back.
    > >
    > > Ick, that's a mess.
    > >
    > > I'll go drop that patch now, odd that it passed my build tests...
    >
    > Uh, please no? It fixes a rather nasty UAF when cgroups are in use.
    > Please just add the other upstream commit as well, I confirmed it applies
    > cleanly and fixes the problem.

    I didn't get that from your email at all, sorry.

    So, what commits, and in what order, should be applied to 5.4.y at the
    moment to resolve this issue?

    thanks,

    greg k-h

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