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-rw-r--r--media/libwebp/dec/buffer_dec.c3
-rw-r--r--media/libwebp/dec/idec_dec.c6
-rw-r--r--media/libwebp/dec/vp8l_dec.c140
3 files changed, 90 insertions, 59 deletions
diff --git a/media/libwebp/dec/buffer_dec.c b/media/libwebp/dec/buffer_dec.c
index c7565c1bf..d72d32b0a 100644
--- a/media/libwebp/dec/buffer_dec.c
+++ b/media/libwebp/dec/buffer_dec.c
@@ -74,7 +74,8 @@ static VP8StatusCode CheckDecBuffer(const WebPDecBuffer* const buffer) {
} else { // RGB checks
const WebPRGBABuffer* const buf = &buffer->u.RGBA;
const int stride = abs(buf->stride);
- const uint64_t size = MIN_BUFFER_SIZE(width, height, stride);
+ const uint64_t size =
+ MIN_BUFFER_SIZE(width * kModeBpp[mode], height, stride);
ok &= (size <= buf->size);
ok &= (stride >= width * kModeBpp[mode]);
ok &= (buf->rgba != NULL);
diff --git a/media/libwebp/dec/idec_dec.c b/media/libwebp/dec/idec_dec.c
index 6777323c7..c9506bc83 100644
--- a/media/libwebp/dec/idec_dec.c
+++ b/media/libwebp/dec/idec_dec.c
@@ -283,10 +283,8 @@ static void RestoreContext(const MBContext* context, VP8Decoder* const dec,
static VP8StatusCode IDecError(WebPIDecoder* const idec, VP8StatusCode error) {
if (idec->state_ == STATE_VP8_DATA) {
- VP8Io* const io = &idec->io_;
- if (io->teardown != NULL) {
- io->teardown(io);
- }
+ // Synchronize the thread, clean-up and check for errors.
+ VP8ExitCritical((VP8Decoder*)idec->dec_, &idec->io_);
}
idec->state_ = STATE_ERROR;
return error;
diff --git a/media/libwebp/dec/vp8l_dec.c b/media/libwebp/dec/vp8l_dec.c
index 6af696ddc..3d303fb22 100644
--- a/media/libwebp/dec/vp8l_dec.c
+++ b/media/libwebp/dec/vp8l_dec.c
@@ -359,12 +359,14 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
int color_cache_bits, int allow_recursion) {
int i, j;
VP8LBitReader* const br = &dec->br_;
+ VP8LBitReader br_tmp;
VP8LMetadata* const hdr = &dec->hdr_;
uint32_t* huffman_image = NULL;
HTreeGroup* htree_groups = NULL;
HuffmanCode* huffman_tables = NULL;
HuffmanCode* next = NULL;
int num_htree_groups = 1;
+ int num_htree_groups_limit = 1;
int max_alphabet_size = 0;
int* code_lengths = NULL;
const int table_size = kTableSize[color_cache_bits];
@@ -388,6 +390,18 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
num_htree_groups = group + 1;
}
}
+ // Check the validity of num_htree_groups. If it seems too big, use a
+ // smaller value for later. This will prevent big memory allocations to end
+ // up with a bad bitstream anyway.
+ // The value of 1000 is totally arbitrary. We know that num_htree_groups
+ // is smaller than (1 << 16) and should be smaller than the number of pixels
+ // (though the format allows it to be bigger).
+ if (num_htree_groups > 1000 || num_htree_groups > xsize * ysize) {
+ num_htree_groups_limit = (xsize * ysize > 1000) ? 1000 : xsize * ysize;
+ br_tmp = dec->br_;
+ } else {
+ num_htree_groups_limit = num_htree_groups;
+ }
}
if (br->eos_) goto Error;
@@ -403,68 +417,86 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
}
}
- huffman_tables = (HuffmanCode*)WebPSafeMalloc(num_htree_groups * table_size,
- sizeof(*huffman_tables));
- htree_groups = VP8LHtreeGroupsNew(num_htree_groups);
code_lengths = (int*)WebPSafeCalloc((uint64_t)max_alphabet_size,
sizeof(*code_lengths));
+ // If num_htree_groups_tmp == num_htree_groups, the following loop is executed
+ // once.
+ // If num_htree_groups_tmp != num_htree_groups, we execute the loop the first
+ // time with little memory allocation in the hope that there is a bitstream
+ // error. If after num_htree_groups_tmp iterations, no error appears,
+ // num_htree_groups is probably the right value so try it out.
+ do {
+ huffman_tables = (HuffmanCode*)WebPSafeMalloc(
+ num_htree_groups_limit * table_size, sizeof(*huffman_tables));
+ htree_groups = VP8LHtreeGroupsNew(num_htree_groups_limit);
+
+ if (htree_groups == NULL || code_lengths == NULL ||
+ huffman_tables == NULL) {
+ dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
+ goto Error;
+ }
- if (htree_groups == NULL || code_lengths == NULL || huffman_tables == NULL) {
- dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
- goto Error;
- }
-
- next = huffman_tables;
- for (i = 0; i < num_htree_groups; ++i) {
- HTreeGroup* const htree_group = &htree_groups[i];
- HuffmanCode** const htrees = htree_group->htrees;
- int size;
- int total_size = 0;
- int is_trivial_literal = 1;
- int max_bits = 0;
- for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
- int alphabet_size = kAlphabetSize[j];
- htrees[j] = next;
- if (j == 0 && color_cache_bits > 0) {
- alphabet_size += 1 << color_cache_bits;
- }
- size = ReadHuffmanCode(alphabet_size, dec, code_lengths, next);
- if (size == 0) {
- goto Error;
- }
- if (is_trivial_literal && kLiteralMap[j] == 1) {
- is_trivial_literal = (next->bits == 0);
- }
- total_size += next->bits;
- next += size;
- if (j <= ALPHA) {
- int local_max_bits = code_lengths[0];
- int k;
- for (k = 1; k < alphabet_size; ++k) {
- if (code_lengths[k] > local_max_bits) {
- local_max_bits = code_lengths[k];
+ next = huffman_tables;
+ for (i = 0; i < num_htree_groups_limit; ++i) {
+ HTreeGroup* const htree_group = &htree_groups[i];
+ HuffmanCode** const htrees = htree_group->htrees;
+ int size;
+ int total_size = 0;
+ int is_trivial_literal = 1;
+ int max_bits = 0;
+ for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
+ int alphabet_size = kAlphabetSize[j];
+ htrees[j] = next;
+ if (j == 0 && color_cache_bits > 0) {
+ alphabet_size += 1 << color_cache_bits;
+ }
+ size = ReadHuffmanCode(alphabet_size, dec, code_lengths, next);
+ if (size == 0) {
+ goto Error;
+ }
+ if (is_trivial_literal && kLiteralMap[j] == 1) {
+ is_trivial_literal = (next->bits == 0);
+ }
+ total_size += next->bits;
+ next += size;
+ if (j <= ALPHA) {
+ int local_max_bits = code_lengths[0];
+ int k;
+ for (k = 1; k < alphabet_size; ++k) {
+ if (code_lengths[k] > local_max_bits) {
+ local_max_bits = code_lengths[k];
+ }
}
+ max_bits += local_max_bits;
}
- max_bits += local_max_bits;
}
- }
- htree_group->is_trivial_literal = is_trivial_literal;
- htree_group->is_trivial_code = 0;
- if (is_trivial_literal) {
- const int red = htrees[RED][0].value;
- const int blue = htrees[BLUE][0].value;
- const int alpha = htrees[ALPHA][0].value;
- htree_group->literal_arb =
- ((uint32_t)alpha << 24) | (red << 16) | blue;
- if (total_size == 0 && htrees[GREEN][0].value < NUM_LITERAL_CODES) {
- htree_group->is_trivial_code = 1;
- htree_group->literal_arb |= htrees[GREEN][0].value << 8;
+ htree_group->is_trivial_literal = is_trivial_literal;
+ htree_group->is_trivial_code = 0;
+ if (is_trivial_literal) {
+ const int red = htrees[RED][0].value;
+ const int blue = htrees[BLUE][0].value;
+ const int alpha = htrees[ALPHA][0].value;
+ htree_group->literal_arb = ((uint32_t)alpha << 24) | (red << 16) | blue;
+ if (total_size == 0 && htrees[GREEN][0].value < NUM_LITERAL_CODES) {
+ htree_group->is_trivial_code = 1;
+ htree_group->literal_arb |= htrees[GREEN][0].value << 8;
+ }
}
+ htree_group->use_packed_table =
+ !htree_group->is_trivial_code && (max_bits < HUFFMAN_PACKED_BITS);
+ if (htree_group->use_packed_table) BuildPackedTable(htree_group);
}
- htree_group->use_packed_table = !htree_group->is_trivial_code &&
- (max_bits < HUFFMAN_PACKED_BITS);
- if (htree_group->use_packed_table) BuildPackedTable(htree_group);
- }
+ // If we have survived up to here, num_htree_groups might actually be
+ // that big so restart with a proper allocation.
+ if (num_htree_groups != num_htree_groups_limit) {
+ num_htree_groups_limit = num_htree_groups;
+ WebPSafeFree(huffman_tables);
+ VP8LHtreeGroupsFree(htree_groups);
+ huffman_tables = NULL;
+ htree_groups = NULL;
+ dec->br_ = br_tmp;
+ }
+ } while (i != num_htree_groups);
WebPSafeFree(code_lengths);
// All OK. Finalize pointers and return.
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-04 09:07:49 +0000