ref: e69f9a2ac600685eeda9aa628d631e4eab8c86aa
parent: c9d7eeee85e5bad495a86f75eb926f5946693726
author: Sebastian Rasmussen <sebras@gmail.com>
date: Wed Mar 11 22:54:08 EDT 2020
jbig2dec: Fix signedness conversions.
--- a/jbig2.c
+++ b/jbig2.c
@@ -211,6 +211,22 @@
return ((uint32_t) get_uint16(bptr) << 16) | get_uint16(bptr + 2);
}
+static size_t
+jbig2_find_buffer_size(size_t desired)
+{+ const size_t initial_buf_size = 1024;
+ size_t size = initial_buf_size;
+
+ if (desired == SIZE_MAX)
+ return SIZE_MAX;
+
+ while (size < desired)
+ size <<= 1;
+
+ return size;
+}
+
+
/**
* jbig2_data_in: submit data for decoding
* @ctx: The jbig2dec decoder context
@@ -226,14 +242,8 @@
int
jbig2_data_in(Jbig2Ctx *ctx, const unsigned char *data, size_t size)
{- const size_t initial_buf_size = 1024;
-
if (ctx->buf == NULL) {- size_t buf_size = initial_buf_size;
-
- do
- buf_size <<= 1;
- while (buf_size < size);
+ size_t buf_size = jbig2_find_buffer_size(size);
ctx->buf = jbig2_new(ctx, byte, buf_size);
if (ctx->buf == NULL) {return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to allocate buffer when reading data");
@@ -241,21 +251,26 @@
ctx->buf_size = buf_size;
ctx->buf_rd_ix = 0;
ctx->buf_wr_ix = 0;
- } else if (ctx->buf_wr_ix + size > ctx->buf_size) {- if (ctx->buf_rd_ix <= (ctx->buf_size >> 1) && ctx->buf_wr_ix - ctx->buf_rd_ix + size <= ctx->buf_size) {- memmove(ctx->buf, ctx->buf + ctx->buf_rd_ix, ctx->buf_wr_ix - ctx->buf_rd_ix);
+ } else if (size > ctx->buf_size - ctx->buf_wr_ix) {+ size_t already = ctx->buf_wr_ix - ctx->buf_rd_ix;
+
+ if (ctx->buf_rd_ix <= (ctx->buf_size >> 1) && size <= ctx->buf_size - already) {+ memmove(ctx->buf, ctx->buf + ctx->buf_rd_ix, already);
} else {byte *buf;
- size_t buf_size = initial_buf_size;
+ size_t buf_size;
- do
- buf_size <<= 1;
- while (buf_size < ctx->buf_wr_ix - ctx->buf_rd_ix + size);
+ if (already > SIZE_MAX - size) {+ return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "read data causes buffer to grow too large");
+ }
+
+ buf_size = jbig2_find_buffer_size(size + already);
+
buf = jbig2_new(ctx, byte, buf_size);
if (buf == NULL) {return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to allocate bigger buffer when reading data");
}
- memcpy(buf, ctx->buf + ctx->buf_rd_ix, ctx->buf_wr_ix - ctx->buf_rd_ix);
+ memcpy(buf, ctx->buf + ctx->buf_rd_ix, already);
jbig2_free(ctx->allocator, ctx->buf);
ctx->buf = buf;
ctx->buf_size = buf_size;
@@ -263,6 +278,7 @@
ctx->buf_wr_ix -= ctx->buf_rd_ix;
ctx->buf_rd_ix = 0;
}
+
memcpy(ctx->buf + ctx->buf_wr_ix, data, size);
ctx->buf_wr_ix += size;
@@ -387,7 +403,7 @@
segment->rows = jbig2_get_uint32(p);
p += 4;
- segment->data_length = p - s;
+ segment->data_length = (size_t) (p - s);
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number, "unknown length determined to be %lu", (long) segment->data_length);
}
else if (segment->data_length > ctx->buf_wr_ix - ctx->buf_rd_ix)
@@ -483,15 +499,15 @@
}
if (offset < z->size) {- val |= z->data[offset] << 24;
+ val = (uint32_t) z->data[offset] << 24;
ret++;
}
if (offset + 1 < z->size) {- val |= z->data[offset + 1] << 16;
+ val |= (uint32_t) z->data[offset + 1] << 16;
ret++;
}
if (offset + 2 < z->size) {- val |= z->data[offset + 2] << 8;
+ val |= (uint32_t) z->data[offset + 2] << 8;
ret++;
}
if (offset + 3 < z->size) {--- a/jbig2_arith.c
+++ b/jbig2_arith.c
@@ -36,10 +36,10 @@
int CT;
uint32_t next_word;
- int next_word_bytes;
+ size_t next_word_bytes;
Jbig2WordStream *ws;
- int offset;
+ size_t offset;
};
/*
@@ -94,10 +94,12 @@
/* next_word_bytes can only be == 1 here, but let's be defensive. */
if (as->next_word_bytes <= 1) {- as->next_word_bytes = as->ws->get_next_word(ctx, as->ws, as->offset, &as->next_word);
- if (as->next_word_bytes < 0) {+ int ret = as->ws->get_next_word(ctx, as->ws, as->offset, &as->next_word);
+ if (ret < 0) {return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to check for marker code due to failure in underlying stream during arithmetic decoding");
}
+
+ as->next_word_bytes = (size_t) ret;
if (as->next_word_bytes == 0) {jbig2_error(ctx, JBIG2_SEVERITY_WARNING, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to read end of possible terminating marker code, assuming terminating marker code");
as->next_word = 0xFF900000;
@@ -151,10 +153,12 @@
as->next_word_bytes--;
if (as->next_word_bytes == 0) {- as->next_word_bytes = as->ws->get_next_word(ctx, as->ws, as->offset, &as->next_word);
- if (as->next_word_bytes < 0) {+ int ret = as->ws->get_next_word(ctx, as->ws, as->offset, &as->next_word);
+ if (ret < 0) {return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to read from underlying stream during arithmetic decoding");
}
+ as->next_word_bytes = (size_t) ret;
+
if (as->next_word_bytes == 0) {jbig2_error(ctx, JBIG2_SEVERITY_WARNING, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to find terminating marker code before end of underlying stream, assuming terminating marker code");
as->next_word = 0xFF900000;
@@ -183,6 +187,7 @@
jbig2_arith_new(Jbig2Ctx *ctx, Jbig2WordStream *ws)
{Jbig2ArithState *result;
+ int ret;
result = jbig2_new(ctx, Jbig2ArithState, 1);
if (result == NULL) {@@ -193,17 +198,20 @@
result->ws = ws;
result->offset = 0;
- result->next_word_bytes = result->ws->get_next_word(ctx, result->ws, result->offset, &result->next_word);
- if (result->next_word_bytes < 0) {+ ret = result->ws->get_next_word(ctx, result->ws, result->offset, &result->next_word);
+ if (ret < 0) {jbig2_free(ctx->allocator, result);
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to initialize underlying stream of arithmetic decoder");
return NULL;
}
+
+ result->next_word_bytes = (size_t) ret;
if (result->next_word_bytes == 0) {jbig2_free(ctx->allocator, result);
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to read first byte from underlying stream when initializing arithmetic decoder");
return NULL;
}
+
result->offset += result->next_word_bytes;
/* Figure F.1 */
--- a/jbig2_arith_iaid.c
+++ b/jbig2_arith_iaid.c
@@ -53,7 +53,7 @@
return NULL;
}
- ctx_size = 1 << SBSYMCODELEN;
+ ctx_size = 1U << SBSYMCODELEN;
result = jbig2_new(ctx, Jbig2ArithIaidCtx, 1);
if (result == NULL) {--- a/jbig2_huffman.c
+++ b/jbig2_huffman.c
@@ -178,7 +178,7 @@
int
jbig2_huffman_skip(Jbig2HuffmanState *hs)
{- int bits = hs->offset_bits & 7;
+ uint32_t bits = hs->offset_bits & 7;
int code;
if (bits) {--- a/jbig2_priv.h
+++ b/jbig2_priv.h
@@ -86,8 +86,8 @@
byte *buf;
size_t buf_size;
- unsigned int buf_rd_ix;
- unsigned int buf_wr_ix;
+ size_t buf_rd_ix;
+ size_t buf_wr_ix;
Jbig2FileState state;