[FFmpeg-devel] [PATCH 1/2] libavutil/base64: Try not to write over the array end

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/2] libavutil/base64: Try not to write over the array end
Date: Sat, 11 May 2024 03:22:53 +0200
Message-ID: <20240511012254.1612731-1-michael@niedermayer.cc> (raw)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavutil/base64.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavutil/base64.c b/libavutil/base64.c
index 3e66f4fcbe5..69e11e6f5e1 100644
--- a/libavutil/base64.c
+++ b/libavutil/base64.c
@@ -127,10 +127,12 @@ validity_check:
     }
 
 out3:
-    *dst++ = v >> 10;
+    if (end - dst)
+        *dst++ = v >> 10;
     v <<= 2;
 out2:
-    *dst++ = v >> 4;
+    if (end - dst)
+        *dst++ = v >> 4;
 out1:
 out0:
     return bits & 1 ? AVERROR_INVALIDDATA : out ? dst - out : 0;
-- 
2.43.2

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