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perf/hw_breakpoint: Fix arch_hw_breakpoint use-before-initialization

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If we disable the compiler's auto-initialization feature, if
-fplugin-arg-structleak_plugin-byref or -ftrivial-auto-var-init=pattern
are disabled, arch_hw_breakpoint may be used before initialization after:

  9a4903dde2 ("perf/hw_breakpoint: Split attribute parse and commit")

On our ARM platform, the struct step_ctrl in arch_hw_breakpoint, which
used to be zero-initialized by kzalloc(), may be used in
arch_install_hw_breakpoint() without initialization.

Signed-off-by: Mark-PK Tsai <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alix Wu <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: YJ Chiang <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
[ Minor edits. ]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Mark-PK Tsai 2019-09-06 14:01:16 +08:00 • committed by Ingo Molnar
commit 310aa0a25b
1 changed files with 2 additions and 2 deletions
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4
kernel/events/hw_breakpoint.c
View file

@ -413,7 +413,7 @@ static int hw_breakpoint_parse(struct perf_event *bp,
int register_perf_hw_breakpoint(struct perf_event *bp)
{
struct arch_hw_breakpoint hw;
struct arch_hw_breakpoint hw = { };
int err;
err = reserve_bp_slot(bp);
@ -461,7 +461,7 @@ int
modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr,
bool check)
{
struct arch_hw_breakpoint hw;
struct arch_hw_breakpoint hw = { };
int err;
err = hw_breakpoint_parse(bp, attr, &hw);