diff --git a/drivers/net/ice/base/ice_nvm.c b/drivers/net/ice/base/ice_nvm.c index 48e0d418e2..9a5241cea4 100644 --- a/drivers/net/ice/base/ice_nvm.c +++ b/drivers/net/ice/base/ice_nvm.c @@ -442,8 +442,7 @@ ice_get_pfa_module_tlv(struct ice_hw *hw, u16 *module_tlv, u16 *module_tlv_len, u16 module_type) { enum ice_status status; - u16 pfa_len, pfa_ptr; - u32 next_tlv; + u16 pfa_len, pfa_ptr, next_tlv, max_tlv; status = ice_read_sr_word(hw, ICE_SR_PFA_PTR, &pfa_ptr); if (status != ICE_SUCCESS) { @@ -455,12 +454,26 @@ ice_get_pfa_module_tlv(struct ice_hw *hw, u16 *module_tlv, u16 *module_tlv_len, ice_debug(hw, ICE_DBG_INIT, "Failed to read PFA length.\n"); return status; } - /* Starting with first TLV after PFA length, iterate through the list + + max_tlv = pfa_ptr + pfa_len - 1; + if (pfa_ptr > max_tlv) { + ice_debug(hw, ICE_DBG_INIT, "PFA starts at offset %u. PFA length of %u caused 16-bit arithmetic overflow.\n", + pfa_ptr, pfa_len); + return ICE_ERR_INVAL_SIZE; + } + + /* The Preserved Fields Area contains a sequence of TLVs which define + * its contents. The PFA length includes all of the TLVs, plus its + * initial length word itself, *and* one final word at the end of all + * of the TLVs. + * + * Starting with first TLV after PFA length, iterate through the list * of TLVs to find the requested one. */ next_tlv = pfa_ptr + 1; - while (next_tlv < ((u32)pfa_ptr + pfa_len)) { + while (next_tlv < max_tlv) { u16 tlv_sub_module_type; + u16 curr_tlv; u16 tlv_len; /* Read TLV type */ @@ -476,10 +489,6 @@ ice_get_pfa_module_tlv(struct ice_hw *hw, u16 *module_tlv, u16 *module_tlv_len, ice_debug(hw, ICE_DBG_INIT, "Failed to read TLV length.\n"); break; } - if (tlv_len > pfa_len) { - ice_debug(hw, ICE_DBG_INIT, "Invalid TLV length.\n"); - return ICE_ERR_INVAL_SIZE; - } if (tlv_sub_module_type == module_type) { if (tlv_len) { *module_tlv = (u16)next_tlv; @@ -488,10 +497,14 @@ ice_get_pfa_module_tlv(struct ice_hw *hw, u16 *module_tlv, u16 *module_tlv_len, } return ICE_ERR_INVAL_SIZE; } - /* Check next TLV, i.e. current TLV pointer + length + 2 words - * (for current TLV's type and length) - */ + + curr_tlv = next_tlv; next_tlv = next_tlv + tlv_len + 2; + if (curr_tlv > next_tlv) { + ice_debug(hw, ICE_DBG_INIT, "TLV of type %u and length 0x%04x caused 16-bit arithmetic overflow. The PFA starts at 0x%04x and has length of 0x%04x\n", + tlv_sub_module_type, tlv_len, pfa_ptr, pfa_len); + return ICE_ERR_INVAL_SIZE; + } } /* Module does not exist */ return ICE_ERR_DOES_NOT_EXIST;