| 1 | @loc exists@ |
| 2 | type T; |
| 3 | identifier E; |
| 4 | identifier f != {kmalloc,kcalloc,kzalloc}; |
| 5 | position pl; |
| 6 | @@ |
| 7 | |
| 8 | T *E; |
| 9 | ... when any |
| 10 | E = f@pl(...) |
| 11 | |
| 12 | @probe forall@ |
| 13 | identifier E; |
| 14 | expression E1,E2; |
| 15 | identifier loc.f,g; |
| 16 | int ret; |
| 17 | statement S; |
| 18 | position loc.pl; |
| 19 | @@ |
| 20 | |
| 21 | ( |
| 22 | E = f@pl(...); |
| 23 | ... when != E |
| 24 | if (<+... E == NULL ...+>) S |
| 25 | | |
| 26 | if (<+...(E = f@pl(...)) == NULL...+>) S |
| 27 | ) |
| 28 | ... when strict |
| 29 | when any |
| 30 | when != E2 = E |
| 31 | when != E = E2 |
| 32 | ( |
| 33 | E1 = E; |
| 34 | | |
| 35 | E = E1;// this could seem bad: the value is being overwritten before being |
| 36 | // saved, but in bd_claim_by_kobject in fs/block_dev, the value is |
| 37 | // first passed to a function that saves it. anyway, we will see if |
| 38 | // this leads to false positives. |
| 39 | | |
| 40 | g(...,E,...); |
| 41 | | |
| 42 | return; |
| 43 | | |
| 44 | return ret; |
| 45 | ) |
| 46 | |
| 47 | // might be a different function than the one matched above |
| 48 | @exists@ |
| 49 | identifier E; |
| 50 | identifier loc.f, probe.g,x; |
| 51 | expression E1; |
| 52 | position loc.pl; |
| 53 | int ret; |
| 54 | @@ |
| 55 | |
| 56 | E = f@pl(...) |
| 57 | ... when strict |
| 58 | when any |
| 59 | when != E1 = E |
| 60 | if (...) { |
| 61 | ... when any |
| 62 | when != E1 = E |
| 63 | when != g(...,E,...) |
| 64 | g(E |
| 65 | + ,"detected allocator",f,g |
| 66 | ); |
| 67 | ... when != E |
| 68 | ( |
| 69 | return; |
| 70 | | |
| 71 | return ret; |
| 72 | ) |
| 73 | } |