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Message-Id: <20200411230347.22371-88-sashal@kernel.org>
Date: Sat, 11 Apr 2020 19:02:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Peikang Zhang <peikang.zhang@....com>, Aric Cyr <Aric.Cyr@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Harry Wentland <harry.wentland@....com>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.6 088/149] drm/amd/display: System crashes when add_ptb_to_table() gets called
From: Peikang Zhang <peikang.zhang@....com>
[ Upstream commit 0062972b9d9f888d0273c6496769d02e8f509135 ]
[Why]
Unused VMIDs were not evicted correctly
[How]
1. evict_vmids() logic was fixed;
2. Added boundary check for add_ptb_to_table() and
clear_entry_from_vmid_table() to avoid crash caused by array out of
boundary;
3. For mod_vmid_get_for_ptb(), vimd is changed from unsigned to signed
due to vimd is signed.
Signed-off-by: Peikang Zhang <peikang.zhang@....com>
Reviewed-by: Aric Cyr <Aric.Cyr@....com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Acked-by: Harry Wentland <harry.wentland@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/amd/display/modules/vmid/vmid.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/modules/vmid/vmid.c b/drivers/gpu/drm/amd/display/modules/vmid/vmid.c
index f0a153704f6e0..00f132f8ad55d 100644
--- a/drivers/gpu/drm/amd/display/modules/vmid/vmid.c
+++ b/drivers/gpu/drm/amd/display/modules/vmid/vmid.c
@@ -40,14 +40,18 @@ struct core_vmid {
static void add_ptb_to_table(struct core_vmid *core_vmid, unsigned int vmid, uint64_t ptb)
{
- core_vmid->ptb_assigned_to_vmid[vmid] = ptb;
- core_vmid->num_vmids_available--;
+ if (vmid < MAX_VMID) {
+ core_vmid->ptb_assigned_to_vmid[vmid] = ptb;
+ core_vmid->num_vmids_available--;
+ }
}
static void clear_entry_from_vmid_table(struct core_vmid *core_vmid, unsigned int vmid)
{
- core_vmid->ptb_assigned_to_vmid[vmid] = 0;
- core_vmid->num_vmids_available++;
+ if (vmid < MAX_VMID) {
+ core_vmid->ptb_assigned_to_vmid[vmid] = 0;
+ core_vmid->num_vmids_available++;
+ }
}
static void evict_vmids(struct core_vmid *core_vmid)
@@ -57,7 +61,7 @@ static void evict_vmids(struct core_vmid *core_vmid)
// At this point any positions with value 0 are unused vmids, evict them
for (i = 1; i < core_vmid->num_vmid; i++) {
- if (ord & (1u << i))
+ if (!(ord & (1u << i)))
clear_entry_from_vmid_table(core_vmid, i);
}
}
@@ -91,7 +95,7 @@ static int get_next_available_vmid(struct core_vmid *core_vmid)
uint8_t mod_vmid_get_for_ptb(struct mod_vmid *mod_vmid, uint64_t ptb)
{
struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid);
- unsigned int vmid = 0;
+ int vmid = 0;
// Physical address gets vmid 0
if (ptb == 0)
--
2.20.1
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