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Ensure methods called by global funcs are init'd

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If a hypothetical calling application does something really stupid and
changes cinfo->data_precision after calling jpeg_start_*compress(), then
the precision-specific methods called by jpeg_write_scanlines(),
jpeg_write_raw_data(), jpeg_finish_compress(), jpeg_read_scanlines(),
jpeg_read_raw_data(), or jpeg_start_output() may not be initialized.

Ensure that the first precision-specific method (which will always be
cinfo->main->process_data*(), cinfo->coef->compress_data*(), or
cinfo->coef->decompress_data()) called by any global function that may
be called after jpeg_start_*compress() is initialized and non-NULL.
This increases the likelihood (but does not guarantee) that a
hypothetical stupid calling application will fail gracefully rather than
segfault if it changes cinfo->data_precision after calling
jpeg_start_*compress().  A hypothetical stupid calling application can
still bork itself by changing cinfo->data_precision after initializing
the source manager but before calling jpeg_start_compress(), or after
initializing the destination manager but before calling
jpeg_start_decompress().
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DRC
2024-12-18 12:50:38 -05:00
parent cc095fee7b
commit e0e18dea54
9 changed files with 44 additions and 6 deletions
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11
ChangeLog.md
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@@ -1,3 +1,14 @@
3.1.1
=====
### Significant changes relative to 3.1.0:
1. Hardened the libjpeg API against hypothetical calling applications that may
erroneously change the value of the `data_precision` field in
`jpeg_compress_struct` or `jpeg_decompress_struct` after calling
`jpeg_start_compress()` or `jpeg_start_decompress()`.
3.1.0
=====