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ipc/shm.c: check for overflows of shm_tot
[cascardo/linux.git]
/
ipc
/
shm.c
diff --git
a/ipc/shm.c
b/ipc/shm.c
index
dda8f1f
..
9e51bf2
100644
(file)
--- a/
ipc/shm.c
+++ b/
ipc/shm.c
@@
-493,7
+493,8
@@
static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
if (size < SHMMIN || size > ns->shm_ctlmax)
return -EINVAL;
- if (ns->shm_tot + numpages > ns->shm_ctlall)
+ if (ns->shm_tot + numpages < ns->shm_tot ||
+ ns->shm_tot + numpages > ns->shm_ctlall)
return -ENOSPC;
shp = ipc_rcu_alloc(sizeof(*shp));