CVE-2024-50104: In the Linux kernel, the following vulnerability has been resolved:  ASoC: qcom: sdm845: add missing soundwire runtime stream alloc  During the migration of Soundwire runtime stream allocation from the Qualcomm Soundwire controller to SoC's soundcard drivers the sdm845 soundcard was forgotten.  At this point any playback attempt or audio daemon startup, for instance on sdm845-db845c (Qualcomm RB3 board), will result in stream pointer NULL dereference:   Unable to handle kernel NULL pointer dereference at virtual  address 0000000000000020  Mem abort info:    ESR = 0x0000000096000004    EC = 0x25: DABT (current EL), IL = 32 bits    SET = 0, FnV = 0    EA = 0, S1PTW = 0    FSC = 0x04: level 0 translation fault  Data abort info:    ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000    CM = 0, WnR = 0, TnD = 0, TagAccess = 0    GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0  user pgtable: 4k pages, 48-bit VAs, pgdp=0000000101ecf000  [0000000000000020] pgd=0000000000000000, p4d=0000000000000000  Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP  Modules linked in: ...  CPU: 5 UID: 0 PID: 1198 Comm: aplay  Not tainted 6.12.0-rc2-qcomlt-arm64-00059-g9d78f315a362-dirty #18  Hardware name: Thundercomm Dragonboard 845c (DT)  pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : sdw_stream_add_slave+0x44/0x380 [soundwire_bus]  lr : sdw_stream_add_slave+0x44/0x380 [soundwire_bus]  sp : ffff80008a2035c0  x29: ffff80008a2035c0 x28: ffff80008a203978 x27: 0000000000000000  x26: 00000000000000c0 x25: 0000000000000000 x24: ffff1676025f4800  x23: ffff167600ff1cb8 x22: ffff167600ff1c98 x21: 0000000000000003  x20: ffff167607316000 x19: ffff167604e64e80 x18: 0000000000000000  x17: 0000000000000000 x16: ffffcec265074160 x15: 0000000000000000  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000  x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000  x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff167600ff1cec  x5 : ffffcec22cfa2010 x4 : 0000000000000000 x3 : 0000000000000003  x2 : ffff167613f836c0 x1 : 0000000000000000 x0 : ffff16761feb60b8  Call trace:   sdw_stream_add_slave+0x44/0x380 [soundwire_bus]   wsa881x_hw_params+0x68/0x80 [snd_soc_wsa881x]   snd_soc_dai_hw_params+0x3c/0xa4   __soc_pcm_hw_params+0x230/0x660   dpcm_be_dai_hw_params+0x1d0/0x3f8   dpcm_fe_dai_hw_params+0x98/0x268   snd_pcm_hw_params+0x124/0x460   snd_pcm_common_ioctl+0x998/0x16e8   snd_pcm_ioctl+0x34/0x58   __arm64_sys_ioctl+0xac/0xf8   invoke_syscall+0x48/0x104   el0_svc_common.constprop.0+0x40/0xe0   do_el0_svc+0x1c/0x28   el0_svc+0x34/0xe0   el0t_64_sync_handler+0x120/0x12c   el0t_64_sync+0x190/0x194  Code: aa0403fb f9418400 9100e000 9400102f (f8420f22)  ---[ end trace 0000000000000000 ]---  0000000000006108 <sdw_stream_add_slave>:     6108:       d503233f        paciasp     610c:       a9b97bfd        stp     x29, x30, [sp, #-112]!     6110:       910003fd        mov     x29, sp     6114:       a90153f3        stp     x19, x20, [sp, #16]     6118:       a9025bf5        stp     x21, x22, [sp, #32]     611c:       aa0103f6        mov     x22, x1     6120:       2a0303f5        mov     w21, w3     6124:       a90363f7        stp     x23, x24, [sp, #48]     6128:       aa0003f8        mov     x24, x0     612c:       aa0203f7        mov     x23, x2     6130:       a9046bf9        stp     x25, x26, [sp, #64]     6134:       aa0403f9        mov     x25, x4        <-- x4 copied to x25     6138:       a90573fb        stp     x27, x28, [sp, #80]     613c:       aa0403fb        mov     x27, x4     6140:       f9418400        ldr     x0, [x0, #776]     6144:       9100e000        add     x0, x0, #0x38     6148:       94000000        bl      0 <mutex_lock>     614c:       f8420f22        ldr     x2, [x25, #32]!  <-- offset 0x44     ^^^ This is 0x6108 + offset 0x44 from the beginning of sdw_stream_add_slave() where data abort happens. wsa881x_hw_params() is called with stream = NULL and passes it further in register x4 (5th argu ---truncated---