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authorTom Sepez <tsepez@chromium.org>2015-05-18 15:46:54 -0700
committerTom Sepez <tsepez@chromium.org>2015-05-18 15:46:54 -0700
commit3b60890f6ee807a8bfc44056443f77603c23e6b0 (patch)
tree2b573d9f0f62d0a03a5b6e1eeb5e78c4b24ed734 /core/src
parent3fea540931b6b2c700c50809a3d4d8a506f4f797 (diff)
downloadpdfium-3b60890f6ee807a8bfc44056443f77603c23e6b0.tar.xz
Cleanup if early return from opj_j2k_copy_default_tcp_and_create_tcd().
The opj_j2k_copy_default_tcp_and_create_tcp() function memcpy's a top-level struct, and then replaces pointers to memory owned by the original struct with new blocks of memory. Unfortunately, an early return can leave the copy with pointers to memory it doesn't own, which causes problems when cleaning up the partially-initialized struct. The referenced bug is triggered when we get a return at original line 7969 or 7385 due to OOM. Moral of the story: creating a "copy constructor" equivalent based on memcpy() instead of copying field by field for structs containing pointers is usually a bad idea. BUG=486538 R=jun_fang@foxitsoftware.com Review URL: https://codereview.chromium.org/1138033007
Diffstat (limited to 'core/src')
-rw-r--r--core/src/fxcodec/fx_libopenjpeg/libopenjpeg20/j2k.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/core/src/fxcodec/fx_libopenjpeg/libopenjpeg20/j2k.c b/core/src/fxcodec/fx_libopenjpeg/libopenjpeg20/j2k.c
index 73dc5ab6fd..c40ecc370d 100644
--- a/core/src/fxcodec/fx_libopenjpeg/libopenjpeg20/j2k.c
+++ b/core/src/fxcodec/fx_libopenjpeg/libopenjpeg20/j2k.c
@@ -7352,6 +7352,12 @@ static OPJ_BOOL opj_j2k_copy_default_tcp_and_create_tcd ( opj_j2k_t * p_j2
/* Initialize some values of the current tile coding parameters*/
l_tcp->ppt = 0;
l_tcp->ppt_data = 00;
+ /* Remove memory not owned by this tile in case of early error return. */
+ l_tcp->m_mct_decoding_matrix = 00;
+ l_tcp->m_nb_max_mct_records = 0;
+ l_tcp->m_mct_records = 00;
+ l_tcp->m_nb_max_mcc_records = 0;
+ l_tcp->m_mcc_records = 00;
/* Reconnect the tile-compo coding parameters pointer to the current tile coding parameters*/
l_tcp->tccps = l_current_tccp;
@@ -7389,6 +7395,9 @@ static OPJ_BOOL opj_j2k_copy_default_tcp_and_create_tcd ( opj_j2k_t * p_j2
++l_src_mct_rec;
++l_dest_mct_rec;
+
+ /* Update with each pass to free exactly what has been allocated on early return. */
+ l_tcp->m_nb_max_mct_records += 1;
}
/* Get the mcc_record of the dflt_tile_cp and copy them into the current tile cp*/
@@ -7398,6 +7407,7 @@ static OPJ_BOOL opj_j2k_copy_default_tcp_and_create_tcd ( opj_j2k_t * p_j2
return OPJ_FALSE;
}
memcpy(l_tcp->m_mcc_records,l_default_tcp->m_mcc_records,l_mcc_records_size);
+ l_tcp->m_nb_max_mcc_records = l_default_tcp->m_nb_max_mcc_records;
/* Copy the mcc record data from dflt_tile_cp to the current tile*/
l_src_mcc_rec = l_default_tcp->m_mcc_records;