[FFmpeg-devel] [PATCH 2/3] avutil/common: assert that bit position in av_zero_extend is valid

[James Almer]

Signed-off-by: James Almer <jamr...@gmail.com>
---
 libavutil/common.h      | 3 +++
 libavutil/x86/intmath.h | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavutil/common.h b/libavutil/common.h
index acd041fb67..65448d47d3 100644
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -296,6 +296,9 @@ static av_always_inline av_const unsigned 
av_clip_uintp2_c(int a, int p)
  */
 static av_always_inline av_const unsigned av_zero_extend_c(unsigned a, 
unsigned p)
 {
+#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
+    if (p > 31) abort();
+#endif
     return a & ((1U << p) - 1);
 }
 
diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h
index 821a06ab66..de6da72129 100644
--- a/libavutil/x86/intmath.h
+++ b/libavutil/x86/intmath.h
@@ -90,8 +90,11 @@ static av_always_inline av_const int ff_ctzll_x86(long long 
v)
 #define av_zero_extend av_zero_extend_bmi2
 static av_always_inline av_const unsigned av_zero_extend_bmi2(unsigned a, 
unsigned p)
 {
+#if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
+    if (p > 31) abort();
+#endif
     if (av_builtin_constant_p(p))
-        return a & ((1 << p) - 1);
+        return a & ((1U << p) - 1);
     else {
         unsigned x;
         __asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p));
-- 
2.45.2

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