[lwip-devel] [bug #50839] NULL pointer exception while using MEMP_OVERFLOW_CHECK=1

[preet]

URL:
  <http://savannah.nongnu.org/bugs/?50839>

                 Summary: NULL pointer exception while using
MEMP_OVERFLOW_CHECK=1
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: preetpal
            Submitted on: Thu 20 Apr 2017 07:19:26 PM UTC
                Category: pbufs
                Severity: 3 - Normal
              Item Group: Crash Error
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.0

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Details:

There is a clear NULL pointer de-reference that needs to be corrected using (p
!= NULL) at two functions at memp.c

static void
memp_overflow_check_element_overflow(struct memp *p, const struct memp_desc
*desc)
{
  u16_t k;
  u8_t *m;
#if MEMP_SANITY_REGION_AFTER_ALIGNED > 0
  if (p != NULL) {
...
  }
#endif
}

static void
memp_overflow_check_element_underflow(struct memp *p, const struct memp_desc
*desc)
{
  u16_t k;
  u8_t *m;
#if MEMP_SANITY_REGION_BEFORE_ALIGNED > 0
  if (p != NULL) {
...
  }
#endif
}




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