Experimental Physics and
Industrial Control System

Link: https://app.codacy.com/gh/epics-base/epics-
base/file/42022654601/issues/source?bid=16430872&fileBranchId=16430872#l950

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https://bugs.launchpad.net/bugs/1862916

Title:
  Possible null pointer dereferencing in
  modules/ca/src/client/udpiiu.cpp

Status in EPICS Base:
  New

Bug description:
  Codacy report an Error level issue on a possible null pointer
  dereferencing  modules/ca/src/client/udpiiu.cpp line 950.

  If the function bool udpiiu::pushDatagramMsg ( epicsGuard < epicsMutex > & guard, const caHdr & msg, const void * pExt, ca_uint16_t extsize ) is called with the following parameters:
  1) pExt == null
  2) extsize > 0

  This will cause the memcpy to read extsize bytes from null, presumably
  crashing the code.

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References:

[Bug 1862916] [NEW] Possible null pointer dereferencing in modules/ca/src/client/udpiiu.cpp Karl Vestin via Core-talk

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