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authorPrasad J Pandit <pjp@fedoraproject.org>2020-05-14 00:55:38 +0530
committerPaolo Bonzini <pbonzini@redhat.com>2020-06-10 12:10:12 -0400
commitf50ab86a2620bd7e8507af865b164655ee921661 (patch)
tree26df3019b59b085903ae1e860d633057f67dfd84 /hw/scsi
parent2a6931425890a9a2822e62f60724a9edbb93ba10 (diff)
megasas: use unsigned type for reply_queue_head and check index
A guest user may set 'reply_queue_head' field of MegasasState to a negative value. Later in 'megasas_lookup_frame' it is used to index into s->frames[] array. Use unsigned type to avoid OOB access issue. Also check that 'index' value stays within s->frames[] bounds through the while() loop in 'megasas_lookup_frame' to avoid OOB access. Reported-by: Ren Ding <rding@gatech.edu> Reported-by: Hanqing Zhao <hanqing@gatech.edu> Reported-by: Alexander Bulekov <alxndr@bu.edu> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Acked-by: Alexander Bulekov <alxndr@bu.edu> Message-Id: <20200513192540.1583887-2-ppandit@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/scsi')
-rw-r--r--hw/scsi/megasas.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index af18c88b65..6ce598cd69 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -112,7 +112,7 @@ typedef struct MegasasState {
uint64_t reply_queue_pa;
void *reply_queue;
int reply_queue_len;
- int reply_queue_head;
+ uint16_t reply_queue_head;
int reply_queue_tail;
uint64_t consumer_pa;
uint64_t producer_pa;
@@ -445,7 +445,7 @@ static MegasasCmd *megasas_lookup_frame(MegasasState *s,
index = s->reply_queue_head;
- while (num < s->fw_cmds) {
+ while (num < s->fw_cmds && index < MEGASAS_MAX_FRAMES) {
if (s->frames[index].pa && s->frames[index].pa == frame) {
cmd = &s->frames[index];
break;