These patches fix cases where a value is tested that was previously
tested. Often the problem is that the tested value has not been updated
properly. Sometimes the test is simply duplicated. These problems were
found using the following semantic match (http://coccinelle.lip6.fr/):
// <smpl>
@r exists@
expression e1,e2;
identifier f,g;
position p1,p2;
@@
if@p1 ( \(e1->f == NULL\|IS_ERR(e1->f)\) ) { ... when forall
return ...; }
... when != \(e1->f = e2\|e1->f += e2\|e1->f -= e2\|e1->f |= e2\|e1->f &=
e2\|e1->f++\|e1->f--\|g(...,e1,...)\)
if@p2 ( \(e1->f == NULL\|IS_ERR(e1->f)\) ) { ... when forall
return ...; }
@rsame exists@
expression e;
position r.p1,r.p2;
statement S1,S2;
@@
if@p1 ( e ) S1
... when any
if@p2 ( e ) S2
@rok depends on rsame exists@
expression e1,e2;
identifier f;
position r.p1,r.p2;
statement S1,S2;
@@
if@p1 ( \(e1->f == NULL\|IS_ERR(e1->f)\) ) S1
... when any
\(e1->f = e2\|e1->f += e2\|e1->f -= e2\|e1->f |= e2\|e1->f &=
e2\|e1->f++\|e1->f--\|g(...,e1,...)\)
... when any
if@p2 ( ... ) S2
@rother depends on rsame exists@
position r.p1,r.p2;
statement S;
@@
... when != if@p1 (...) S
if@p2 ( ... ) { ... return ...; }
@script:python depends on rsame && !rok && !rother@
p1 << r.p1;
p2 << r.p2;
@@
if (p1[0].line != p2[0].line):
cocci.print_main("",p1)
cocci.print_secs("",p2)
@s exists@
local idexpression y;
expression e;
position p1,p2;
@@
if@p1 ( \(y == NULL\|IS_ERR(y)\|y != 0\) ) { ... when forall
return ...; }
... when != \(y = e\|y += e\|y -= e\|y |= e\|y &=
e\|y++\|y--\|&y\|XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\)
if@p2 ( \(y == NULL\|IS_ERR(y)\|y != 0\) ) { ... when forall
return ...; }
@ssame exists@
expression e;
position s.p1,s.p2;
statement S1,S2;
@@
if@p1 ( e ) S1
... when any
if@p2 ( e ) S2
@sok depends on ssame exists@
local idexpression y;
expression e;
position s.p1,s.p2;
statement S1,S2;
@@
if@p1 ( \(y == NULL\|IS_ERR(y)\|y != 0\) ) S1
... when any
\(y = e\|y += e\|y -= e\|y |= e\|y &=
e\|y++\|y--\|&y\|XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\)
... when any
if@p2 ( ... ) S2
@sother depends on ssame exists@
position s.p1,s.p2;
statement S;
@@
... when != if@p1 (...) S
if@p2 ( ... ) { ... return ...; }
@script:python depends on ssame && !sok && !sother@
p1 << s.p1;
p2 << s.p2;
@@
if (p1[0].line != p2[0].line):
cocci.print_main("",p1)
cocci.print_secs("",p2)
// </smpl>
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