avcodec/tiff: more completely check bpp/bppcount

Fixes pixel format selection
Fixes out of array accesses
Fixes: asan_heap-oob_1766029_6_asan_heap-oob_20aa045_332_cov_1823216757_m2-d1d366d7965db766c19a66c7a2ccbb6b.tif

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/tiff.c

@@ -814,13 +814,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
         s->height = value;
         break;
     case TIFF_BPP:
-        s->bppcount = count;
-        if (count > 4) {
+        if (count > 4U) {
             av_log(s->avctx, AV_LOG_ERROR,
                    "This format is not supported (bpp=%d, %d components)\n",
-                   s->bpp, count);
+                   value, count);
             return AVERROR_INVALIDDATA;
         }
+        s->bppcount = count;
         if (count == 1)
             s->bpp = value;
         else {
@@ -838,6 +838,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
                 s->bpp = -1;
             }
         }
+        if (s->bpp > 64U) {
+            av_log(s->avctx, AV_LOG_ERROR,
+                   "This format is not supported (bpp=%d, %d components)\n",
+                   s->bpp, count);
+            s->bpp = 0;
+            return AVERROR_INVALIDDATA;
+        }
         break;
     case TIFF_SAMPLES_PER_PIXEL:
         if (count != 1) {