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gpu: nvgpu: fix use of untrusted scalar value

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Kind value can be passed to API nvgpu_vm_map() from User
space (through IOCTL NVGPU_AS_IOCTL_MAP_BUFFER_EX)

But kind value is not checked for sane values
before storing it in bfr.kind_v
And then we use this kind value as array index
in gk20a_kind_is_supported() which is incorrect

Fix this by ensuring in nvgpu_vm_map() that the
kind value is well within range

Bug 200291879
Coverity id : 2567923
Coverity id : 2567924

Change-Id: Ic57395018727cbd2260c929581db256e427316c6
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1496597
GVS: Gerrit_Virtual_Submit
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Deepak Nibade
2017-06-05 16:02:46 +05:30
committed by mobile promotions
parent 793bc318c5
commit 9902a49b0b
3 changed files with 10 additions and 3 deletions
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8
drivers/gpu/nvgpu/common/linux/vm.c
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@@ -25,6 +25,7 @@
#include "gk20a/gk20a.h"
#include "gk20a/mm_gk20a.h"
#include "gk20a/kind_gk20a.h"
#include "vm_priv.h"
@@ -237,7 +238,12 @@ u64 nvgpu_vm_map(struct vm_gk20a *vm,
goto clean_up;
}
bfr.kind_v = kind;
if (kind >= NV_KIND_ATTR_SIZE) {
err = -EINVAL;
goto clean_up;
} else {
bfr.kind_v = kind;
}
bfr.size = dmabuf->size;
sgl = bfr.sgt->sgl;