tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 4c116febc8d53bc1f8f25a3d60db331f17ab8cd8 commit: c6a3607c78f8035db0efc67cb41374fe49e4709d [1364/1364] ALSA: usb-audio: More validations of descriptor units config: x86_64-randconfig-123-20250102 (https://download.01.org/0day-ci/archive/20250102/202501022347.2K2GsA8U-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250102/202501022347.2K2GsA8U-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202501022347.2K2GsA8U-lkp@intel.com/ sparse warnings: (new ones prefixed by >>)

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sound/usb/validate.c:113:26: sparse: sparse: restricted __le16 degrades to integer sound/usb/validate.c:113:26: sparse: sparse: restricted __le16 degrades to integer sound/usb/validate.c:128:26: sparse: sparse: restricted __le16 degrades to integer sound/usb/validate.c:128:26: sparse: sparse: restricted __le16 degrades to integer sound/usb/validate.c:145:26: sparse: sparse: restricted __le16 degrades to integer sound/usb/validate.c:145:26: sparse: sparse: restricted __le16 degrades to integer

vim +113 sound/usb/validate.c 67 68 /* both for processing and extension units; covering all UACs */ 69 static bool validate_processing_unit(const void *p, 70 const struct usb_desc_validator *v) 71 { 72 const struct uac_processing_unit_descriptor *d = p; 73 const unsigned char *hdr = p; 74 size_t len, m; 75 76 if (d->bLength < sizeof(*d)) 77 return false; 78 len = d->bLength < sizeof(*d) + d->bNrInPins; 79 if (d->bLength < len) 80 return false; 81 switch (v->protocol) { 82 case UAC_VERSION_1: 83 default: 84 /* bNrChannels, wChannelConfig, iChannelNames, bControlSize */ 85 len += 1 + 2 + 1 + 1; 86 if (d->bLength < len) /* bControlSize */ 87 return false; 88 m = hdr[len]; 89 len += 1 + m + 1; /* bControlSize, bmControls, iProcessing */ 90 break; 91 case UAC_VERSION_2: 92 /* bNrChannels, bmChannelConfig, iChannelNames */ 93 len += 1 + 4 + 1; 94 if (v->type == UAC2_PROCESSING_UNIT_V2) 95 len += 2; /* bmControls -- 2 bytes for PU */ 96 else 97 len += 1; /* bmControls -- 1 byte for EU */ 98 len += 1; /* iProcessing */ 99 break; 100 case UAC_VERSION_3: 101 /* wProcessingDescrStr, bmControls */ 102 len += 2 + 4; 103 break; 104 } 105 if (d->bLength < len) 106 return false; 107 108 switch (v->protocol) { 109 case UAC_VERSION_1: 110 default: 111 if (v->type == UAC1_EXTENSION_UNIT) 112 return true; /* OK */

113 switch (d->wProcessType) { 114 case UAC_PROCESS_UP_DOWNMIX: 115 case UAC_PROCESS_DOLBY_PROLOGIC: 116 if (d->bLength < len + 1) /* bNrModes */ 117 return false; 118 m = hdr[len]; 119 len += 1 + m * 2; /* bNrModes, waModes(n) */ 120 break; 121 default: 122 break; 123 } 124 break; 125 case UAC_VERSION_2: 126 if (v->type == UAC2_EXTENSION_UNIT_V2) 127 return true; /* OK */ 128 switch (d->wProcessType) { 129 case UAC2_PROCESS_UP_DOWNMIX: 130 case UAC2_PROCESS_DOLBY_PROLOCIC: /* SiC! */ 131 if (d->bLength < len + 1) /* bNrModes */ 132 return false; 133 m = hdr[len]; 134 len += 1 + m * 4; /* bNrModes, daModes(n) */ 135 break; 136 default: 137 break; 138 } 139 break; 140 case UAC_VERSION_3: 141 if (v->type == UAC3_EXTENSION_UNIT) { 142 len += 2; /* wClusterDescrID */ 143 break; 144 } 145 switch (d->wProcessType) { 146 case UAC3_PROCESS_UP_DOWNMIX: 147 if (d->bLength < len + 1) /* bNrModes */ 148 return false; 149 m = hdr[len]; 150 len += 1 + m * 2; /* bNrModes, waClusterDescrID(n) */ 151 break; 152 case UAC3_PROCESS_MULTI_FUNCTION: 153 len += 2 + 4; /* wClusterDescrID, bmAlgorighms */ 154 break; 155 default: 156 break; 157 } 158 break; 159 } 160 if (d->bLength < len) 161 return false; 162 163 return true; 164 } 165

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