avcodec/alsdec: Check r to prevent out of array read

No testcase known Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
9 years ago · c36fc857b5
parent 1748eb02c8
commit c36fc857b5
1 changed files with 5 additions and 0 deletions
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@ -767,6 +767,11 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)

            r                 = get_unary(gb, 0, 4);
            c                 = get_bits(gb, 2);
+            if (r >= 4) {
+                av_log(avctx, AV_LOG_ERROR, "r overflow\n");
+                return AVERROR_INVALIDDATA;
+            }
+
            bd->ltp_gain[2]   = ltp_gain_values[r][c];

            bd->ltp_gain[3]   = decode_rice(gb, 2) << 3;