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Fix for SGI Decode buffer overrun CVE-2020-35655

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* Independently found by a contributor and sent to Tidelift, and by Google's OSS Fuzz.
This commit is contained in:
Eric Soroos 2020-10-29 23:07:15 +00:00 committed by Andrew Murray
parent e6ef8a6c09
commit 7e95c63fa7
4 changed files with 23 additions and 8 deletions
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Tests/images/crash-6b7f2244da6d0ae297ee0754a424213444e92778.sgi Normal file
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Tests/images/ossfuzz-5730089102868480.sgi Normal file
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8
Tests/test_sgi_crash.py
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@ -6,7 +6,13 @@ from PIL import Image
@pytest.mark.parametrize(
"test_file",
["Tests/images/sgi_overrun_expandrowF04.bin", "Tests/images/sgi_crash.bin"],
[
"Tests/images/sgi_overrun_expandrowF04.bin",
"Tests/images/sgi_crash.bin",
"Tests/images/crash-6b7f2244da6d0ae297ee0754a424213444e92778.sgi",
"Tests/images/ossfuzz-5730089102868480.sgi",
],
)
def test_crashes(test_file):
with open(test_file, "rb") as f:

23
src/libImaging/SgiRleDecode.c
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@ -112,11 +112,27 @@ ImagingSgiRleDecode(Imaging im, ImagingCodecState state,
int err = 0;
int status;
/* size check */
if (im->xsize > INT_MAX / im->bands ||
im->ysize > INT_MAX / im->bands) {
return IMAGING_CODEC_MEMORY;
}
/* Get all data from File descriptor */
c = (SGISTATE*)state->context;
_imaging_seek_pyFd(state->fd, 0L, SEEK_END);
c->bufsize = _imaging_tell_pyFd(state->fd);
c->bufsize -= SGI_HEADER_SIZE;
c->tablen = im->bands * im->ysize;
/* below, we populate the starttab and lentab into the bufsize,
each with 4 bytes per element of tablen
Check here before we allocate any memory
*/
if (c->bufsize < 8*c->tablen) {
return IMAGING_CODEC_MEMORY;
}
ptr = malloc(sizeof(UINT8) * c->bufsize);
if (!ptr) {
return IMAGING_CODEC_MEMORY;
@ -134,18 +150,11 @@ ImagingSgiRleDecode(Imaging im, ImagingCodecState state,
state->ystep = 1;
}
if (im->xsize > INT_MAX / im->bands ||
im->ysize > INT_MAX / im->bands) {
err = IMAGING_CODEC_MEMORY;
goto sgi_finish_decode;
}
/* Allocate memory for RLE tables and rows */
free(state->buffer);
state->buffer = NULL;
/* malloc overflow check above */
state->buffer = calloc(im->xsize * im->bands, sizeof(UINT8) * 2);
c->tablen = im->bands * im->ysize;
c->starttab = calloc(c->tablen, sizeof(UINT32));
c->lengthtab = calloc(c->tablen, sizeof(UINT32));
if (!state->buffer ||