• Jisheng Zhang's avatar
    usb: chipidea: udc: fix NULL pointer dereference if udc_start failed · f2967b72
    Jisheng Zhang authored
    commit aa1f058d upstream.
    
    Fix below NULL pointer dereference. we set ci->roles[CI_ROLE_GADGET]
    too early in ci_hdrc_gadget_init(), if udc_start() fails due to some
    reason, the ci->roles[CI_ROLE_GADGET] check in  ci_hdrc_gadget_destroy
    can't protect us.
    
    We fix this issue by only setting ci->roles[CI_ROLE_GADGET] if
    udc_start() succeed.
    
    [    1.398550] Unable to handle kernel NULL pointer dereference at
    virtual address 00000000
    ...
    [    1.448600] PC is at dma_pool_free+0xb8/0xf0
    [    1.453012] LR is at dma_pool_free+0x28/0xf0
    [    2.113369] [<ffffff80081817d8>] dma_pool_free+0xb8/0xf0
    [    2.118857] [<ffffff800841209c>] destroy_eps+0x4c/0x68
    [    2.124165] [<ffffff8008413770>] ci_hdrc_gadget_destroy+0x28/0x50
    [    2.130461] [<ffffff800840fa30>] ci_hdrc_probe+0x588/0x7e8
    [    2.136129] [<ffffff8008380fb8>] platform_drv_probe+0x50/0xb8
    [    2.142066] [<ffffff800837f494>] driver_probe_device+0x1fc/0x2a8
    [    2.148270] [<ffffff800837f68c>] __device_attach_driver+0x9c/0xf8
    [    2.154563] [<ffffff800837d570>] bus_for_each_drv+0x58/0x98
    [    2.160317] [<ffffff800837f174>] __device_attach+0xc4/0x138
    [    2.166072] [<ffffff800837f738>] device_initial_probe+0x10/0x18
    [    2.172185] [<ffffff800837e58c>] bus_probe_device+0x94/0xa0
    [    2.177940] [<ffffff800837c560>] device_add+0x3f0/0x560
    [    2.183337] [<ffffff8008380d20>] platform_device_add+0x180/0x240
    [    2.189541] [<ffffff800840f0e8>] ci_hdrc_add_device+0x440/0x4f8
    [    2.195654] [<ffffff8008414194>] ci_hdrc_usb2_probe+0x13c/0x2d8
    [    2.201769] [<ffffff8008380fb8>] platform_drv_probe+0x50/0xb8
    [    2.207705] [<ffffff800837f494>] driver_probe_device+0x1fc/0x2a8
    [    2.213910] [<ffffff800837f5ec>] __driver_attach+0xac/0xb0
    [    2.219575] [<ffffff800837d4b0>] bus_for_each_dev+0x60/0xa0
    [    2.225329] [<ffffff800837ec80>] driver_attach+0x20/0x28
    [    2.230816] [<ffffff800837e880>] bus_add_driver+0x1d0/0x238
    [    2.236571] [<ffffff800837fdb0>] driver_register+0x60/0xf8
    [    2.242237] [<ffffff8008380ef4>] __platform_driver_register+0x44/0x50
    [    2.248891] [<ffffff80086fd440>] ci_hdrc_usb2_driver_init+0x18/0x20
    [    2.255365] [<ffffff8008082950>] do_one_initcall+0x38/0x128
    [    2.261121] [<ffffff80086e0d00>] kernel_init_freeable+0x1ac/0x250
    [    2.267414] [<ffffff800852f0b8>] kernel_init+0x10/0x100
    [    2.272810] [<ffffff8008082680>] ret_from_fork+0x10/0x50
    
    Fixes: 3f124d23 ("usb: chipidea: add role init and destroy APIs")
    Signed-off-by: default avatarJisheng Zhang <jszhang@marvell.com>
    Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    f2967b72
udc.c 47.8 KB