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[mac] ensure frame validation checks occur before reading FCF (#2845)

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Credit to OSS-Fuzz.
This commit is contained in:
Jonathan Hui
2018-07-02 10:44:28 -05:00
committed by GitHub
parent 30222e8538
commit 10666f5c1e
1 changed files with 2 additions and 3 deletions
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src/core/mac/mac_frame.cpp
+2 -3
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@@ -891,8 +891,7 @@ exit:
uint8_t Frame::FindPayloadIndex(void) const
{
uint16_t fcf = GetFrameControlField();
uint8_t index = SkipSecurityHeaderIndex();
uint8_t index = SkipSecurityHeaderIndex();
#if OPENTHREAD_CONFIG_ENABLE_TIME_SYNC
uint8_t *cur = NULL;
uint8_t *footer = GetFooter();
@@ -929,7 +928,7 @@ uint8_t Frame::FindPayloadIndex(void) const
#endif
// Command ID
if ((fcf & kFcfFrameTypeMask) == kFcfFrameMacCmd)
if ((GetFrameControlField() & kFcfFrameTypeMask) == kFcfFrameMacCmd)
{
index += kCommandIdSize;
}