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CUDA: fix FA out-of-bounds writes (#7465)

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Johannes Gäßler 2024-05-22 17:58:25 +02:00 committed by GitHub
parent b18532a4ef
commit 38c03478a3
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4 changed files with 18 additions and 2 deletions
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4
ggml-cuda/fattn-tile-f16.cu
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@ -238,6 +238,10 @@ static __global__ void flash_attn_tile_ext_f16(
for (int j_VKQ_0 = 0; j_VKQ_0 < ncols; j_VKQ_0 += nwarps) {
const int j_VKQ = j_VKQ_0 + threadIdx.y;
if (ic0 + j_VKQ >= ne01) {
return;
}
half kqsum_j = __low2half(kqsum[j_VKQ_0/nwarps]) + __high2half(kqsum[j_VKQ_0/nwarps]);
kqsum_j = warp_reduce_sum(kqsum_j);

4
ggml-cuda/fattn-tile-f32.cu
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@ -237,6 +237,10 @@ static __global__ void flash_attn_tile_ext_f32(
for (int j_VKQ_0 = 0; j_VKQ_0 < ncols; j_VKQ_0 += nwarps) {
const int j_VKQ = j_VKQ_0 + threadIdx.y;
if (ic0 + j_VKQ >= ne01) {
return;
}
float kqsum_j = kqsum[j_VKQ_0/nwarps];
kqsum_j = warp_reduce_sum(kqsum_j);

6
ggml-cuda/fattn-vec-f16.cu
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@ -212,6 +212,10 @@ static __global__ void flash_attn_vec_ext_f16(
#pragma unroll
for (int j_VKQ = 0; j_VKQ < ncols; ++j_VKQ) {
if (ic0 + j_VKQ >= ne01) {
break;
}
kqsum[j_VKQ] = kqsum_shared[j_VKQ][threadIdx.x];
kqsum[j_VKQ] = warp_reduce_sum(kqsum[j_VKQ]);
@ -223,7 +227,7 @@ static __global__ void flash_attn_vec_ext_f16(
dst[j_dst*D*gridDim.y + D*blockIdx.y + tid] = dst_val;
}
if (parallel_blocks != 1 && tid < ncols) {
if (parallel_blocks != 1 && tid < ncols && ic0 + tid < ne01) {
dst_meta[(ic0 + tid)*gridDim.y*parallel_blocks + blockIdx.y*parallel_blocks + ip] = make_float2(kqmax[tid], kqsum[tid]);
}
#else

6
ggml-cuda/fattn-vec-f32.cu
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@ -200,6 +200,10 @@ static __global__ void flash_attn_vec_ext_f32(
#pragma unroll
for (int j_VKQ = 0; j_VKQ < ncols; ++j_VKQ) {
if (ic0 + j_VKQ >= ne01) {
break;
}
kqsum[j_VKQ] = kqsum_shared[j_VKQ][threadIdx.x];
kqsum[j_VKQ] = warp_reduce_sum(kqsum[j_VKQ]);
@ -211,7 +215,7 @@ static __global__ void flash_attn_vec_ext_f32(
dst[j_dst*D*gridDim.y + D*blockIdx.y + tid] = dst_val;
}
if (parallel_blocks != 1 && tid < ncols) {
if (parallel_blocks != 1 && tid < ncols && ic0 + tid < ne01) {
dst_meta[(ic0 + tid)*gridDim.y*parallel_blocks + blockIdx.y*parallel_blocks + ip] = make_float2(kqmax[tid], kqsum[tid]);
}
}