evie/android_kernel_oneplus_msm8998
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msm: kgsl: Fix overflow in sharedmem cache range operation function

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There could be possibility of integer overflow on adding
size with maximum offset bytes and result in a value smaller
than maximum memdesc size.

CRs-Fixed: 1082914
Change-Id: Ie66b3a8ca2ca418a4a52f65987266b8d580c121f
Signed-off-by: Sudeep Yedalapure <sudeepy@codeaurora.org>
This commit is contained in:
Sudeep Yedalapure 2016-11-04 21:47:41 +05:30
parent e1f711f8e0
commit b63c4eb6c7
1 changed files with 3 additions and 4 deletions
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7
drivers/gpu/msm/kgsl_sharedmem.c
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@ -574,12 +574,11 @@ int kgsl_cache_range_op(struct kgsl_memdesc *memdesc, uint64_t offset,
void *addr = (memdesc->hostptr) ?
memdesc->hostptr : (void *) memdesc->useraddr;
/* Make sure that size is non-zero */
if (!size)
if (size == 0 || size > UINT_MAX)
return -EINVAL;
/* Make sure that the offset + size isn't bigger than we can handle */
if ((offset + size) > ULONG_MAX)
/* Make sure that the offset + size does not overflow */
if ((offset + size < offset) || (offset + size < size))
return -ERANGE;
/* Make sure the offset + size do not overflow the address */