nb/intel/nehalem: Prevent out of bounds read
If the decoded SPD DRAM frequency is slower than the controller minimum,
then there will be an unsigned integer underflow in the following loop,
which will lead to a very large out of bounds array access. Ensure this
does not happen.
Change-Id: Ic8ed1293adfe0866781bd638323977abd110777e
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1229675
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33383
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/northbridge/intel/nehalem/raminit.c b/src/northbridge/intel/nehalem/raminit.c
index b4ff85c..fadf0e0 100644
--- a/src/northbridge/intel/nehalem/raminit.c
+++ b/src/northbridge/intel/nehalem/raminit.c
@@ -595,6 +595,8 @@
info->
spd[channel][slot][CAS_LATENCY_TIME]);
}
+ if (cycletime > min_cycletime[0])
+ die("RAM init: Decoded SPD DRAM freq is slower than the controller minimum!");
for (clock_speed_index = 0; clock_speed_index < 3; clock_speed_index++) {
if (cycletime == min_cycletime[clock_speed_index])
break;