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Avoid integer overflow in BmpDecoder::readData

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This solves https://g-issues.oss-fuzz.com/issues/457623761
This commit is contained in:
Vincent Rabaud
2025-11-19 10:20:06 +01:00
parent f627368ebc
commit 01cce12ce7
3 changed files with 9 additions and 9 deletions
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modules/imgcodecs/src/utils.cpp
+4 -4
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@@ -435,7 +435,7 @@ bool IsColorPalette( PaletteEntry* palette, int bpp )
uchar* FillUniColor( uchar* data, uchar*& line_end,
int step, int width3,
int& y, int height,
int count3, PaletteEntry clr )
ptrdiff_t count3, PaletteEntry clr )
{
do
{
@@ -444,7 +444,7 @@ uchar* FillUniColor( uchar* data, uchar*& line_end,
if( end > line_end )
end = line_end;
count3 -= (int)(end - data);
count3 -= end - data;
for( ; data < end; data += 3 )
{
@@ -467,7 +467,7 @@ uchar* FillUniColor( uchar* data, uchar*& line_end,
uchar* FillUniGray( uchar* data, uchar*& line_end,
int step, int width,
int& y, int height,
int count, uchar clr )
ptrdiff_t count, uchar clr )
{
do
{
@@ -476,7 +476,7 @@ uchar* FillUniGray( uchar* data, uchar*& line_end,
if( end > line_end )
end = line_end;
count -= (int)(end - data);
count -= end - data;
for( ; data < end; data++ )
{