From: Martin Liska Date: Tue, 25 Oct 2016 14:16:10 +0000 (+0200) Subject: Fix not caught use-after-scope with -O1 (PR sanitize/78106) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8e104951788de1a591287637d2b29fa37d8822ea;p=gcc.git Fix not caught use-after-scope with -O1 (PR sanitize/78106) PR sanitizer/78106 * sanopt.c (imm_dom_path_with_freeing_call): Handle gasm statements as they can also contain possibly a freeing call. PR sanitizer/78106 * gcc.dg/asan/pr78106.c: New test. From-SVN: r241511 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e0601576db7..65483863f71 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2016-10-25 Martin Liska + + PR sanitizer/78106 + * sanopt.c (imm_dom_path_with_freeing_call): Handle gasm + statements as they can also contain possibly a freeing call. + 2016-10-25 H.J. Lu Martin Liska diff --git a/gcc/sanopt.c b/gcc/sanopt.c index 27c43da539f..8a6fbe9da95 100644 --- a/gcc/sanopt.c +++ b/gcc/sanopt.c @@ -211,8 +211,12 @@ imm_dom_path_with_freeing_call (basic_block bb, basic_block dom) for (gsi = gsi_start_bb (e->src); !gsi_end_p (gsi); gsi_next (&gsi)) { gimple *stmt = gsi_stmt (gsi); + gasm *asm_stmt; - if (is_gimple_call (stmt) && !nonfreeing_call_p (stmt)) + if ((is_gimple_call (stmt) && !nonfreeing_call_p (stmt)) + || ((asm_stmt = dyn_cast (stmt)) + && (gimple_asm_clobbers_memory_p (asm_stmt) + || gimple_asm_volatile_p (asm_stmt)))) { pred_info->has_freeing_call_p = true; break; diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index c7c233f6c92..edc026eb44f 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-10-25 Martin Liska + + PR sanitizer/78106 + * gcc.dg/asan/pr78106.c: New test. + 2016-10-25 Martin Liska * gcc.dg/ipa/ipa-icf-32.c: Removed one scanned pattern. diff --git a/gcc/testsuite/gcc.dg/asan/pr78106.c b/gcc/testsuite/gcc.dg/asan/pr78106.c new file mode 100644 index 00000000000..d333f9bc082 --- /dev/null +++ b/gcc/testsuite/gcc.dg/asan/pr78106.c @@ -0,0 +1,31 @@ +/* PR sanitizer/78106 */ +/* { dg-do compile } */ +/* { dg-options "-fsanitize=address -fdump-tree-sanopt-details" } */ + +int *variable; + +void __attribute__((used)) release() +{ + __builtin_free (variable); +} + +int main2(int argc) +{ + *variable = 2; + + if (argc <= 5) + asm volatile ("call release"); + + *variable = 2; + __builtin_abort (); + + return 0; +} + +int main(int argc, char **argv) +{ + variable = __builtin_malloc (sizeof(int)); + return main2(argc); +} + +/* { dg-final { scan-tree-dump-not "Optimizing out(\n|\r\n|\r) ASAN_CHECK \\(7, variable.*" "sanopt" } } */