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| author | Nicolas Pena <npm@chromium.org> | 2017-05-04 12:08:43 -0400 |
|---|---|---|
| committer | Chromium commit bot <commit-bot@chromium.org> | 2017-05-04 18:50:27 +0000 |
| commit | 34f735c9ef34b3bb6493016c7fbeb6df76cf31f5 (patch) | |
| tree | 14200502c3b1bbff1b045da10ce8e574adb6341e | |
| parent | cf53b788ca1c097c0cbbca3dee048520eb9dabd4 (diff) | |
| download | pdfium-34f735c9ef34b3bb6493016c7fbeb6df76cf31f5.tar.xz | |
Fix undefined shift in opj_get_all_encoding_parameters
The value 1u << (l_pdx + l_level_no) is only used to calculate a minimum,
so skip it when the shift doesn't even fit unsigned integer. Also use the uint
min version since all values being considered are unsigned anyways.
Bug: chromium:666892
Change-Id: I79c6e52022aa894033c5cdabec29c4b8313e293b
Reviewed-on: https://pdfium-review.googlesource.com/4891
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>
| -rw-r--r-- | third_party/libopenjpeg20/0030-undefined-shift-opj_get_all_encoding_parameters.patch | 29 | ||||
| -rw-r--r-- | third_party/libopenjpeg20/README.pdfium | 1 | ||||
| -rw-r--r-- | third_party/libopenjpeg20/pi.c | 12 |
3 files changed, 36 insertions, 6 deletions
diff --git a/third_party/libopenjpeg20/0030-undefined-shift-opj_get_all_encoding_parameters.patch b/third_party/libopenjpeg20/0030-undefined-shift-opj_get_all_encoding_parameters.patch new file mode 100644 index 0000000000..3ba3a2f5b0 --- /dev/null +++ b/third_party/libopenjpeg20/0030-undefined-shift-opj_get_all_encoding_parameters.patch @@ -0,0 +1,29 @@ +diff --git a/third_party/libopenjpeg20/pi.c b/third_party/libopenjpeg20/pi.c +index 083674222..6af38d0ca 100644 +--- a/third_party/libopenjpeg20/pi.c ++++ b/third_party/libopenjpeg20/pi.c +@@ -782,18 +782,18 @@ static void opj_get_all_encoding_parameters( const opj_image_t *p_image, + /* use custom size for precincts*/ + l_level_no = l_tccp->numresolutions - 1; + for (resno = 0; resno < l_tccp->numresolutions; ++resno) { +- OPJ_UINT32 l_dx, l_dy; +- + /* precinct width and height*/ + l_pdx = l_tccp->prcw[resno]; + l_pdy = l_tccp->prch[resno]; + *lResolutionPtr++ = l_pdx; + *lResolutionPtr++ = l_pdy; +- l_dx = l_img_comp->dx * (1u << (l_pdx + l_level_no)); +- l_dy = l_img_comp->dy * (1u << (l_pdy + l_level_no)); + /* take the minimum size for l_dx for each comp and resolution*/ +- *p_dx_min = (OPJ_UINT32)opj_int_min((OPJ_INT32)*p_dx_min, (OPJ_INT32)l_dx); +- *p_dy_min = (OPJ_UINT32)opj_int_min((OPJ_INT32)*p_dy_min, (OPJ_INT32)l_dy); ++ if (l_pdx + l_level_no < 32) { ++ *p_dx_min = opj_uint_min(*p_dx_min, l_img_comp->dx * (1u << (l_pdx + l_level_no))); ++ } ++ if (l_pdy + l_level_no < 32) { ++ *p_dy_min = opj_uint_min(*p_dy_min, l_img_comp->dy * (1u << (l_pdy + l_level_no))); ++ } + + /* various calculations of extents*/ + l_rx0 = opj_int_ceildivpow2(l_tcx0, (OPJ_INT32)l_level_no); diff --git a/third_party/libopenjpeg20/README.pdfium b/third_party/libopenjpeg20/README.pdfium index 9ce0c05706..a75de2cca1 100644 --- a/third_party/libopenjpeg20/README.pdfium +++ b/third_party/libopenjpeg20/README.pdfium @@ -39,4 +39,5 @@ Local Modifications: 0027-undefined-shift-opj_t1_decode_cblk.patch: upstream fix for a ubsan bug. 0028-upstream-check-size-in-opj_j2k_read_siz.patch: upstream patch in j2k.c. 0029-avoid-division-by-0: fix some /0 and %0 in pi.c (caused by bad shifts). +0030-undefined-shift-opj_get_all_encoding_parameters.patch: fix undefined shift in pi.c method. TODO(thestig): List all the other patches. diff --git a/third_party/libopenjpeg20/pi.c b/third_party/libopenjpeg20/pi.c index 0836742222..6af38d0caa 100644 --- a/third_party/libopenjpeg20/pi.c +++ b/third_party/libopenjpeg20/pi.c @@ -782,18 +782,18 @@ static void opj_get_all_encoding_parameters( const opj_image_t *p_image, /* use custom size for precincts*/ l_level_no = l_tccp->numresolutions - 1; for (resno = 0; resno < l_tccp->numresolutions; ++resno) { - OPJ_UINT32 l_dx, l_dy; - /* precinct width and height*/ l_pdx = l_tccp->prcw[resno]; l_pdy = l_tccp->prch[resno]; *lResolutionPtr++ = l_pdx; *lResolutionPtr++ = l_pdy; - l_dx = l_img_comp->dx * (1u << (l_pdx + l_level_no)); - l_dy = l_img_comp->dy * (1u << (l_pdy + l_level_no)); /* take the minimum size for l_dx for each comp and resolution*/ - *p_dx_min = (OPJ_UINT32)opj_int_min((OPJ_INT32)*p_dx_min, (OPJ_INT32)l_dx); - *p_dy_min = (OPJ_UINT32)opj_int_min((OPJ_INT32)*p_dy_min, (OPJ_INT32)l_dy); + if (l_pdx + l_level_no < 32) { + *p_dx_min = opj_uint_min(*p_dx_min, l_img_comp->dx * (1u << (l_pdx + l_level_no))); + } + if (l_pdy + l_level_no < 32) { + *p_dy_min = opj_uint_min(*p_dy_min, l_img_comp->dy * (1u << (l_pdy + l_level_no))); + } /* various calculations of extents*/ l_rx0 = opj_int_ceildivpow2(l_tcx0, (OPJ_INT32)l_level_no); |