[BUG]LTS 5.10 regression NULL pointer deref in nvme_ioctl

[Chaitanya Kulkarni]

On 6/8/22 01:02, Jinpu Wang wrote:
> Hi folks on nvme list,
> 
> We hitt the following crash when run "nvme list" on kernel 5.10.115:
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/arch/x86/kernel/dumpstack.c:
> 359
> 
>   #4 [ffffa80c7a5c7d10] no_context at ffffffffa7062467
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/arch/x86/mm/fault.c: 754
> 
>   #5 [ffffa80c7a5c7d78] exc_page_fault at ffffffffa77c919e
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/arch/x86/mm/fault.c: 1327
> 
>   #6 [ffffa80c7a5c7dd0] asm_exc_page_fault at ffffffffa7800a6e
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/./arch/x86/include/asm/idtentry.h:
> 571
> 
>   #7 [ffffa80c7a5c7e58] nvme_ioctl at ffffffffc10c1038 [nvme_core]
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/drivers/nvme/host/nvme.h: 609
> 
>   #8 [ffffa80c7a5c7ec0] blkdev_ioctl at ffffffffa73f6bc5
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/block/ioctl.c: 237
> 
>   #9 [ffffa80c7a5c7f08] block_ioctl at ffffffffa72c3329
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/fs/block_dev.c: 1893
> 
> #10 [ffffa80c7a5c7f10] __x64_sys_ioctl at ffffffffa7292fe4
> 
>      /build/ionos-linux-pOGXys/ionos-linux-5.10.42/fs/ioctl.c: 49
> 
> 
> 
> 607 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
> 
> 608 {
> 
> 609         get_device(ctrl->device);
> 
> 610 }
> The same commands works on kernel 5.4.
> 
> kernel 5.10 panic while processing nvme2 which is  a bit different.
> 

Did you try if it works on the latest kernel ?

-ck