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    SubjectRe: [PATCH RFC] serio HIL MLC: don't deref null, don't leak and return proper error
    On Sat, Nov 20, 2010 at 10:13:45PM +0100, Helge Deller wrote:
    > On 11/09/2010 07:35 AM, Dmitry Torokhov wrote:
    > >On Sun, Nov 07, 2010 at 08:36:33PM +0100, Jesper Juhl wrote:
    > >>Hi,
    > >>
    > >>While reviewing various users of kernel memory allocation functions I came
    > >>across drivers/input/serio/hil_mlc.c::hil_mlc_register() and noticed that
    > >> - it calls kzalloc() buf fails to check for a NULL return before use.
    > >> - it makes several allocations and if one fails it doesn't free the
    > >> previous ones.
    > >> - It doesn't return -ENOMEM in the failed memory allocation case (it just
    > >> crashes).
    > >>This patch corrects all of the above and also reworks the only caller of
    > >>this function that I could find
    > >>(drivers/input/serio/hp_sdc_mlc.c::hp_sdc_mlc_out()) so that it now checks
    > >>the return value of hil_mlc_register() and properly propagate it on
    > >>failure and I also restructured the code to remove some labels and goto's
    > >>to make it, IMHO nicer to read.
    > >>
    > >>I have no hardware to test, so please review carefully and let me know if
    > >>I've done something completely stupid. Please don't merge this RFC patch
    > >>unless at least one or more people who know this code and can actually
    > >>test it have ACK'ed it.
    > >I think Helge Deller (CCed) used to have access to such hardware...
    > Yes, and I tested the patch successfully.
    > Tested-by: Helge Deller <>
    > Acked-by: Helge Deller <>

    Applied, thank you guys.


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