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DO NOT MERGE Prevent out of bound memory access in GetInvInt

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In GetInvInt(int) function, malicious content can access memory
 outside of the invCount array. Always bound access to valid
 indices.

Test: see bug for malicious content, decoded with "stagefright -s -a"
Bug: 65025048

Change-Id: Id1f1582bc5afc76e3e90128d92034a5899a9b51e
This commit is contained in:
Jean-Michel Trivi 2017-10-30 14:07:07 -07:00
parent 78653b30e9
commit 76c4625fe3
1 changed files with 8 additions and 4 deletions
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12
libFDK/include/fixpoint_math.h
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@ -450,15 +450,19 @@ inline FIXP_DBL fAddSaturate(const FIXP_DBL a, const FIXP_DBL b)
/**
* \brief Calculate the value of 1/i where i is a integer value. It supports
* input values from 1 upto 50.
* input values from 0 upto 49.
* \param intValue Integer input value.
* \param FIXP_DBL representation of 1/intValue
*/
inline FIXP_DBL GetInvInt(int intValue)
{
FDK_ASSERT((intValue > 0) && (intValue < 50));
FDK_ASSERT(intValue<50);
return invCount[intValue];
FDK_ASSERT((intValue >= 0) && (intValue < 50));
if (intValue < 0)
return invCount[0];
else if (intValue > 49)
return invCount[49];
else
return invCount[intValue];
}