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replace 'ptr + y * stride' by 'ptr += stride'

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This is to prevent potential overflow.

Change-Id: I9d21cfe790ba975bd5e117b025ea4d9deaeae4ab
This commit is contained in:
Pascal Massimino
2017-01-04 00:54:23 -08:00
parent 00b08c88c0
commit 259e98286a
4 changed files with 134 additions and 98 deletions
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8
examples/anim_util.c
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@ -150,6 +150,7 @@ static int DumpFrame(const char filename[], const char dump_folder[],
const char* base_name = NULL;
char* file_name = NULL;
FILE* f = NULL;
const char* row;
base_name = strrchr(filename, '/');
base_name = (base_name == NULL) ? filename : base_name + 1;
@ -176,12 +177,13 @@ static int DumpFrame(const char filename[], const char dump_folder[],
fprintf(stderr, "Write error for file %s\n", file_name);
goto End;
}
row = (const char*)rgba;
for (y = 0; y < canvas_height; ++y) {
if (fwrite((const char*)(rgba) + y * canvas_width * kNumChannels,
canvas_width * kNumChannels, 1, f) != 1) {
if (fwrite(row, canvas_width * kNumChannels, 1, f) != 1) {
fprintf(stderr, "Error writing to file: %s\n", file_name);
goto End;
}
row += canvas_width * kNumChannels;
}
ok = 1;
End:
@ -743,7 +745,7 @@ void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
for (y = 0; y < height; ++y) {
for (x = 0; x < stride; x += kNumChannels) {
int k;
const size_t offset = y * stride + x;
const size_t offset = (size_t)y * stride + x;
const int alpha1 = rgba1[offset + kAlphaChannel];
const int alpha2 = rgba2[offset + kAlphaChannel];
Accumulate(alpha1, alpha2, &f_max_diff, &sse);