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Code Block

bgColor	#ccccff
lang	c

png_charp chunkdata;
chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
if (chunkdata == NULL) {
  /* Handle Allocationallocation Errorerror */
}

Noncompliant Code Example

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Code Block

bgColor	#ccccff
lang	c

size_t size = strlen(input_str)+1;
str = (char *)malloc(size);
if (str == NULL) {
  /* Handle Allocationallocation Errorerror */
}
memcpy(str, input_str, size);
/* ... */
free(str);
str = NULL;

...

Coverity_V

Tool Version Checker Description

Compass/ROSE

Can detect violations of this rule. In particular, ROSE ensures that any pointer returned by malloc(), calloc(), or realloc() is first checked for NULL before being used (otherwise, it is free()-d). ROSE does not handle cases where an allocation is assigned to an lvalue that is not a variable (such as a struct member or C++ function call returning a reference).

Coverity

Include Page

	Coverity_V
	Coverity_V

CHECKED_RETURN

NULL_RETURNS

REVERSE_INULL

FORWARD_NULL

Finds instances where a pointer is checked against NULL and then later dereferenced.

Coverity

Include Page

Coverity_V

NULL_RETURNS

Identifies functions that can return a null pointer but are not checked.

Coverity

Include Page

Coverity_V

REVERSE_INULL

Identifies code that dereferences a pointer and then checks the pointer against NULL.

Coverity

Include Page

Coverity_V

FORWARD_NULL

Can find the instances where NULL is explicitly dereferenced or a pointer is checked against NULL but then dereferenced anyway. Coverity Prevent cannot discover all violations of this rule, so further verification is necessary.

Fortify SCA

5.0

Klocwork

Include Page

	Klocwork_V
	Klocwork_V

NPD.* *RNPD.*

LDRA tool suite

Include Page

	LDRA_V
	LDRA_V

45 D

Fully implemented.

PRQA QA-C

Include Page

	PRQA_V
	PRQA_V

0504
0505
0506

Fully implemented.

Splint

Include Page

	Splint_V
	Splint_V

...

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Old Version 117

New Version 118

Key

Noncompliant Code Example