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Merge #5763

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5763: Fix png error handling by setting jmpbuf r=def- a=Jupeyy

else libpng will kill the thread on an error bcs it's a fatal error.

broken skin can be found in discord bugs channel weeb_okayu

## Checklist

- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Jupeyy <jupjopjap@gmail.com>
This commit is contained in:
bors[bot] 2022-08-31 08:57:02 +00:00 committed by GitHub
parent 487d85bdf8 dfaf3591c2
commit 59db32e9c2
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 86 additions and 56 deletions
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76
src/engine/gfx/image_loader.cpp
View file

@ -1,6 +1,7 @@
#include "image_loader.h"
#include <base/log.h>
#include <base/system.h>
#include <csetjmp>
#include <cstdlib>
#include <png.h>
@ -8,20 +9,22 @@
struct SLibPNGWarningItem
{
SImageByteBuffer *m_pByteLoader;
const char *pFileName;
const char *m_pFileName;
std::jmp_buf m_Buf;
};
static void LibPNGError(png_structp png_ptr, png_const_charp error_msg)
[[noreturn]] static void LibPNGError(png_structp png_ptr, png_const_charp error_msg)
{
SLibPNGWarningItem *pUserStruct = (SLibPNGWarningItem *)png_get_error_ptr(png_ptr);
pUserStruct->m_pByteLoader->m_Err = -1;
dbg_msg("libpng", "error for file \"%s\": %s", pUserStruct->pFileName, error_msg);
dbg_msg("libpng", "error for file \"%s\": %s", pUserStruct->m_pFileName, error_msg);
std::longjmp(pUserStruct->m_Buf, 1);
}
static void LibPNGWarning(png_structp png_ptr, png_const_charp warning_msg)
{
SLibPNGWarningItem *pUserStruct = (SLibPNGWarningItem *)png_get_error_ptr(png_ptr);
dbg_msg("libpng", "warning for file \"%s\": %s", pUserStruct->pFileName, warning_msg);
dbg_msg("libpng", "warning for file \"%s\": %s", pUserStruct->m_pFileName, warning_msg);
}
static bool FileMatchesImageType(SImageByteBuffer &ByteLoader)
@ -75,6 +78,7 @@ static void LibPNGSetImageFormat(EImageFormat &ImageFormat, int LibPNGColorType)
static void LibPNGDeleteReadStruct(png_structp pPNGStruct, png_infop pPNGInfo)
{
if(pPNGInfo != nullptr)
png_destroy_info_struct(pPNGStruct, &pPNGInfo);
png_destroy_read_struct(&pPNGStruct, NULL, NULL);
}
@ -127,6 +131,15 @@ static int PngliteIncompatibility(png_structp pPNGStruct, png_infop pPNGInfo)
bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIncompatible, int &Width, int &Height, uint8_t *&pImageBuff, EImageFormat &ImageFormat)
{
png_infop pPNGInfo = nullptr;
int ColorType;
png_byte BitDepth;
int ColorChannelCount;
int BytesInRow;
Height = 0;
png_bytepp pRowPointers = nullptr;
SLibPNGWarningItem UserErrorStruct = {&ByteLoader, pFileName, {}};
png_structp pPNGStruct = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(pPNGStruct == NULL)
@ -135,7 +148,22 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
return false;
}
png_infop pPNGInfo = png_create_info_struct(pPNGStruct);
if(setjmp(UserErrorStruct.m_Buf))
{
if(pRowPointers != nullptr)
{
for(int i = 0; i < Height; ++i)
{
delete[] pRowPointers[i];
}
}
delete[] pRowPointers;
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
png_set_error_fn(pPNGStruct, &UserErrorStruct, LibPNGError, LibPNGWarning);
pPNGInfo = png_create_info_struct(pPNGStruct);
if(pPNGInfo == NULL)
{
@ -144,9 +172,6 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
return false;
}
SLibPNGWarningItem UserErrorStruct = {&ByteLoader, pFileName};
png_set_error_fn(pPNGStruct, &UserErrorStruct, LibPNGError, LibPNGWarning);
if(!FileMatchesImageType(ByteLoader))
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
@ -169,12 +194,10 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
Width = png_get_image_width(pPNGStruct, pPNGInfo);
Height = png_get_image_height(pPNGStruct, pPNGInfo);
int ColorType = png_get_color_type(pPNGStruct, pPNGInfo);
png_byte BitDepth = png_get_bit_depth(pPNGStruct, pPNGInfo);
ColorType = png_get_color_type(pPNGStruct, pPNGInfo);
BitDepth = png_get_bit_depth(pPNGStruct, pPNGInfo);
PngliteIncompatible = PngliteIncompatibility(pPNGStruct, pPNGInfo);
bool PNGErr = false;
if(BitDepth == 16)
{
png_set_strip_16(pPNGStruct);
@ -182,17 +205,17 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
else if(BitDepth > 8)
{
dbg_msg("png", "non supported bit depth.");
PNGErr = true;
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
if(Width == 0 || Height == 0 || BitDepth == 0)
{
dbg_msg("png", "image had width, height or bit depth of 0.");
PNGErr = true;
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
if(!PNGErr)
{
if(ColorType == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(pPNGStruct);
@ -204,12 +227,12 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
png_read_update_info(pPNGStruct, pPNGInfo);
int ColorChannelCount = LibPNGGetColorChannelCount(ColorType);
int BytesInRow = png_get_rowbytes(pPNGStruct, pPNGInfo);
ColorChannelCount = LibPNGGetColorChannelCount(ColorType);
BytesInRow = png_get_rowbytes(pPNGStruct, pPNGInfo);
if(BytesInRow == Width * ColorChannelCount)
{
png_bytepp pRowPointers = new png_bytep[Height];
pRowPointers = new png_bytep[Height];
for(int y = 0; y < Height; ++y)
{
pRowPointers[y] = new png_byte[BytesInRow];
@ -219,8 +242,6 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
if(ByteLoader.m_Err == 0)
pImageBuff = (uint8_t *)malloc((size_t)Height * (size_t)Width * (size_t)ColorChannelCount * sizeof(uint8_t));
else
PNGErr = true;
for(int i = 0; i < Height; ++i)
{
@ -229,17 +250,26 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
delete[] pRowPointers[i];
}
delete[] pRowPointers;
pRowPointers = nullptr;
if(ByteLoader.m_Err != 0)
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
LibPNGSetImageFormat(ImageFormat, ColorType);
}
else
PNGErr = true;
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
png_destroy_info_struct(pPNGStruct, &pPNGInfo);
png_destroy_read_struct(&pPNGStruct, NULL, NULL);
return !PNGErr;
return true;
}
static void WriteDataFromLoadedBytes(png_structp pPNGStruct, png_bytep pOutBytes, png_size_t ByteCountToWrite)