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charset="utf-8" The remaining space in a command slot may be smaller than the size of the command header. Clearing the command header with memset() before verifying the available slot space can result in an out-of-bounds write and memory corruption. Fix this by moving the memset() call after the size validation. Fixes: 3d32eb7a5ecf ("accel/amdxdna: Fix cu_idx being cleared by memset() d= uring command setup") Signed-off-by: Lizhi Hou Reviewed-by: Mario Limonciello (AMD) --- drivers/accel/amdxdna/aie2_message.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/accel/amdxdna/aie2_message.c b/drivers/accel/amdxdna/a= ie2_message.c index 7d7dcfeaf794..8fbbc3280468 100644 --- a/drivers/accel/amdxdna/aie2_message.c +++ b/drivers/accel/amdxdna/aie2_message.c @@ -694,11 +694,11 @@ aie2_cmdlist_fill_npu_cf(struct amdxdna_gem_obj *cmd_= bo, void *slot, size_t *siz u32 cmd_len; void *cmd; =20 - memset(npu_slot, 0, sizeof(*npu_slot)); cmd =3D amdxdna_cmd_get_payload(cmd_bo, &cmd_len); if (*size < sizeof(*npu_slot) + cmd_len) return -EINVAL; =20 + memset(npu_slot, 0, sizeof(*npu_slot)); npu_slot->cu_idx =3D amdxdna_cmd_get_cu_idx(cmd_bo); if (npu_slot->cu_idx =3D=3D INVALID_CU_IDX) return -EINVAL; @@ -719,7 +719,6 @@ aie2_cmdlist_fill_npu_dpu(struct amdxdna_gem_obj *cmd_b= o, void *slot, size_t *si u32 cmd_len; u32 arg_sz; =20 - memset(npu_slot, 0, sizeof(*npu_slot)); sn =3D amdxdna_cmd_get_payload(cmd_bo, &cmd_len); arg_sz =3D cmd_len - sizeof(*sn); if (cmd_len < sizeof(*sn) || arg_sz > MAX_NPU_ARGS_SIZE) @@ -728,6 +727,7 @@ aie2_cmdlist_fill_npu_dpu(struct amdxdna_gem_obj *cmd_b= o, void *slot, size_t *si if (*size < sizeof(*npu_slot) + arg_sz) return -EINVAL; =20 + memset(npu_slot, 0, sizeof(*npu_slot)); npu_slot->cu_idx =3D amdxdna_cmd_get_cu_idx(cmd_bo); if (npu_slot->cu_idx =3D=3D INVALID_CU_IDX) return -EINVAL; @@ -751,7 +751,6 @@ aie2_cmdlist_fill_npu_preempt(struct amdxdna_gem_obj *c= md_bo, void *slot, size_t u32 cmd_len; u32 arg_sz; =20 - memset(npu_slot, 0, sizeof(*npu_slot)); pd =3D amdxdna_cmd_get_payload(cmd_bo, &cmd_len); arg_sz =3D cmd_len - sizeof(*pd); if (cmd_len < sizeof(*pd) || arg_sz > MAX_NPU_ARGS_SIZE) @@ -760,6 +759,7 @@ aie2_cmdlist_fill_npu_preempt(struct amdxdna_gem_obj *c= md_bo, void *slot, size_t if (*size < sizeof(*npu_slot) + arg_sz) return -EINVAL; =20 + memset(npu_slot, 0, sizeof(*npu_slot)); npu_slot->cu_idx =3D amdxdna_cmd_get_cu_idx(cmd_bo); if (npu_slot->cu_idx =3D=3D INVALID_CU_IDX) return -EINVAL; @@ -787,7 +787,6 @@ aie2_cmdlist_fill_npu_elf(struct amdxdna_gem_obj *cmd_b= o, void *slot, size_t *si u32 cmd_len; u32 arg_sz; =20 - memset(npu_slot, 0, sizeof(*npu_slot)); pd =3D amdxdna_cmd_get_payload(cmd_bo, &cmd_len); arg_sz =3D cmd_len - sizeof(*pd); if (cmd_len < sizeof(*pd) || arg_sz > MAX_NPU_ARGS_SIZE) @@ -796,6 +795,7 @@ aie2_cmdlist_fill_npu_elf(struct amdxdna_gem_obj *cmd_b= o, void *slot, size_t *si if (*size < sizeof(*npu_slot) + arg_sz) return -EINVAL; =20 + memset(npu_slot, 0, sizeof(*npu_slot)); npu_slot->type =3D EXEC_NPU_TYPE_ELF; npu_slot->inst_buf_addr =3D pd->inst_buf; npu_slot->save_buf_addr =3D pd->save_buf; --=20 2.34.1