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Fix Out of bounds read when saving GIF of xsize=1

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This commit is contained in:
Eric Soroos 2020-12-26 19:07:16 +01:00
parent 2d7c543a2f
commit d96945b7c8
2 changed files with 11 additions and 4 deletions
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8
Tests/test_file_gif.py
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@ -74,10 +74,10 @@ def test_optimize():
im.save(test_file, "GIF", optimize=optimize) im.save(test_file, "GIF", optimize=optimize)
return len(test_file.getvalue()) return len(test_file.getvalue())
assert test_grayscale(0) == 800 assert test_grayscale(0) == 799
assert test_grayscale(1) == 44 assert test_grayscale(1) == 43
assert test_bilevel(0) == 800 assert test_bilevel(0) == 799
assert test_bilevel(1) == 800 assert test_bilevel(1) == 799
def test_optimize_correctness(): def test_optimize_correctness():

7
src/libImaging/GifEncode.c
View File

@ -233,6 +233,13 @@ ImagingGifEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
} }
} }
/* Potential special case for xsize==1 */
if (state->x < state->xsize) {
this = state->buffer[state->x++];
} else {
EMIT_RUN(label0);
break;
}
this = state->buffer[state->x++]; this = state->buffer[state->x++];