In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix variable 'mcafuncs' dereferenced before NULL check in 'amdgpumcasmugetmcaentry()' Fixes the below: drivers/gpu/drm/amd/amdgpu/amdgpumca.c:377 amdgpumcasmugetmcaentry() warn: variable dereferenced before check 'mcafuncs' (see line 368) 357 int amdgpumcasmugetmcaentry(struct amdgpudevice *adev, enum amdgpumcaerrortype type, 358 int idx, struct mcabankentry *entry) 359 { 360 const struct amdgpumcasmufuncs *mcafuncs = adev->mca.mcafuncs; 361 int count; 362 363 switch (type) { 364 case AMDGPUMCAERRORTYPEUE: 365 count = mcafuncs->maxuecount; mcafuncs is dereferenced here. 366 break; 367 case AMDGPUMCAERRORTYPECE: 368 count = mcafuncs->maxcecount; mcafuncs is dereferenced here. 369 break; 370 default: 371 return -EINVAL; 372 } 373 374 if (idx >= count) 375 return -EINVAL; 376 377 if (mcafuncs && mcafuncs->mcagetmcaentry) ^^^^^^^^^ Checked too late!
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