[FFmpeg-devel] [PATCH 3/4] avcodec/jpeglsdec: Check Jpeg-LS LSE

[Michael Niedermayer <michael@niedermayer.cc>]

Fixes: signed integer overflow: 2147478526 + 33924 cannot be represented in type 'int'
Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 64243/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEGLS_fuzzer-5195717848989696

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/jpeglsdec.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index ec163b8964d..c245cf0279c 100644
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -382,6 +382,19 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
     state->T3     = s->t3;
     state->reset  = s->reset;
     ff_jpegls_reset_coding_parameters(state, 0);
+
+    /* Testing parameters here, we cannot test in LSE or SOF because
+     * these interdepend and are allowed in either order
+     */
+    if (state->maxval >= (1<<state->bpp) ||
+        state->T1 > state->T2 ||
+        state->T2 > state->T3 ||
+        state->T3 > state->maxval ||
+        state->reset > FFMAX(255, state->maxval)) {
+        ret = AVERROR_INVALIDDATA;
+        goto end;
+    }
+
     ff_jpegls_init_state(state);
 
     if (s->bits <= 8)
-- 
2.17.1

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