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    Subject[PATCH] base/class.c: prevent ooops due to insert/remove race
    While doing insert/remove (quickly) tests on USB, I managed to trigger
    an Oops on on the call to strlen() in make_class_name().

    This patch prevents this oops.

    There is still the larger problem of the overall race
    that caused this in the first place, but much of the rest
    of the code in class.c appears to also do NULL checks to
    avoid Oops'ing, so this continues the tradition.

    Signed-off-by: Mark Lord <>

    Patch applies to both 2.6.24 and 2.6.23.

    --- old/drivers/base/class.c 2007-11-28 22:54:59.000000000 -0500
    +++ linux/drivers/base/class.c 2007-11-28 22:54:48.000000000 -0500
    @@ -354,6 +354,8 @@
    char *class_name;
    int size;

    + if (!name)
    + return NULL;
    size = strlen(name) + strlen(kobject_name(kobj)) + 2;

    class_name = kmalloc(size, GFP_KERNEL);
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      Last update: 2007-11-29 05:03    [W:0.020 / U:1.236 seconds]
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