[PATCH AUTOSEL 4.19 06/25] xfrm: Update ipcomp_scratches with NULL when freed

From: Sasha Levin
Date: Sun Oct 09 2022 - 18:56:29 EST


From: Khalid Masum <khalid.masum.92@xxxxxxxxx>

[ Upstream commit 8a04d2fc700f717104bfb95b0f6694e448a4537f ]

Currently if ipcomp_alloc_scratches() fails to allocate memory
ipcomp_scratches holds obsolete address. So when we try to free the
percpu scratches using ipcomp_free_scratches() it tries to vfree non
existent vm area. Described below:

static void * __percpu *ipcomp_alloc_scratches(void)
{
...
scratches = alloc_percpu(void *);
if (!scratches)
return NULL;
ipcomp_scratches does not know about this allocation failure.
Therefore holding the old obsolete address.
...
}

So when we free,

static void ipcomp_free_scratches(void)
{
...
scratches = ipcomp_scratches;
Assigning obsolete address from ipcomp_scratches

if (!scratches)
return;

for_each_possible_cpu(i)
vfree(*per_cpu_ptr(scratches, i));
Trying to free non existent page, causing warning: trying to vfree
existent vm area.
...
}

Fix this breakage by updating ipcomp_scrtches with NULL when scratches
is freed

Suggested-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Reported-by: syzbot+5ec9bb042ddfe9644773@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+5ec9bb042ddfe9644773@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Khalid Masum <khalid.masum.92@xxxxxxxxx>
Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/xfrm/xfrm_ipcomp.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index a00ec715aa46..32aed1d0f6ee 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -216,6 +216,7 @@ static void ipcomp_free_scratches(void)
vfree(*per_cpu_ptr(scratches, i));

free_percpu(scratches);
+ ipcomp_scratches = NULL;
}

static void * __percpu *ipcomp_alloc_scratches(void)
--
2.35.1