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[34.83.118.50]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74eb9dd5d30sm6304510b3a.5.2025.07.11.14.29.06 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Jul 2025 14:29:06 -0700 (PDT) From: Andreas Rheinhardt X-Google-Original-From: Andreas Rheinhardt Message-Id: In-Reply-To: References: X-Original-From: Andreas Rheinhardt Date: Fri, 11 Jul 2025 21:28:51 +0000 Fcc: Sent MIME-Version: 1.0 To: ffmpeg-devel@ffmpeg.org Subject: [FFmpeg-devel] [PATCH 1/4] avformat/aviobuf: Keep checksum_ptr consistent in avio_seek() X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Andreas Rheinhardt Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: From: Andreas Rheinhardt Otherwise it might be > buf_ptr in which case ffio_get_checksum() could segfault (s->buf_ptr - s->checksum_ptr would be negative which would be converted to something very big when converted to unsigned for the update_checksum callback). Fixes ticket #11233. Reported-by: Du4t Signed-off-by: Andreas Rheinhardt --- libavformat/aviobuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c index 6a74c1ce68..9041280e77 100644 --- a/libavformat/aviobuf.c +++ b/libavformat/aviobuf.c @@ -308,7 +308,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) ctx->seek_count++; if (!s->write_flag) s->buf_end = s->buffer; - s->buf_ptr = s->buf_ptr_max = s->buffer; + s->checksum_ptr = s->buf_ptr = s->buf_ptr_max = s->buffer; s->pos = offset; } s->eof_reached = 0; -- ffmpeg-codebot _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".