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| author | Rob Herring <robh@kernel.org> | 2021-04-14 22:57:58 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-04-20 14:11:33 +0300 |
| commit | 818869489ba3c4a4ed1360e22b2f66be488ea9f5 (patch) | |
| tree | 6fc70f9cdaa9efb3640caa03f2752962ef865c6f /tools/lib | |
| parent | 47d01e7b9999b9591077a59a1ecec11c6ce570de (diff) | |
| download | linux-818869489ba3c4a4ed1360e22b2f66be488ea9f5.tar.xz | |
libperf xyarray: Add bounds checks to xyarray__entry()
xyarray__entry() is missing any bounds checking yet often the x and y
parameters come from external callers. Add bounds checks and an
unchecked __xyarray__entry().
Committer notes:
Make the 'x' and 'y' arguments to the new xyarray__entry() that does
bounds check to be of type 'size_t', so that we cover also the case
where 'x' and 'y' could be negative, which is needed anyway as having
them as 'int' breaks the build with:
/home/acme/git/perf/tools/lib/perf/include/internal/xyarray.h: In function ‘xyarray__entry’:
/home/acme/git/perf/tools/lib/perf/include/internal/xyarray.h:28:8: error: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Werror=sign-compare]
28 | if (x >= xy->max_x || y >= xy->max_y)
| ^~
/home/acme/git/perf/tools/lib/perf/include/internal/xyarray.h:28:26: error: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Werror=sign-compare]
28 | if (x >= xy->max_x || y >= xy->max_y)
| ^~
cc1: all warnings being treated as errors
Signed-off-by: Rob Herring <robh@kernel.org>
Suggested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Suggested-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210414195758.4078803-1-robh@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/perf/include/internal/xyarray.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/tools/lib/perf/include/internal/xyarray.h b/tools/lib/perf/include/internal/xyarray.h index 51e35d6c8ec4..f10af3da7b21 100644 --- a/tools/lib/perf/include/internal/xyarray.h +++ b/tools/lib/perf/include/internal/xyarray.h @@ -18,11 +18,18 @@ struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size); void xyarray__delete(struct xyarray *xy); void xyarray__reset(struct xyarray *xy); -static inline void *xyarray__entry(struct xyarray *xy, int x, int y) +static inline void *__xyarray__entry(struct xyarray *xy, int x, int y) { return &xy->contents[x * xy->row_size + y * xy->entry_size]; } +static inline void *xyarray__entry(struct xyarray *xy, size_t x, size_t y) +{ + if (x >= xy->max_x || y >= xy->max_y) + return NULL; + return __xyarray__entry(xy, x, y); +} + static inline int xyarray__max_y(struct xyarray *xy) { return xy->max_y; |