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fix(ocr): add NULL checks and fix memory leaks#1798

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cfsmp3 merged 2 commits intomasterfrom
fix/ocr-memory-safety
Dec 13, 2025
Merged

fix(ocr): add NULL checks and fix memory leaks#1798
cfsmp3 merged 2 commits intomasterfrom
fix/ocr-memory-safety

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@cfsmp3 cfsmp3 commented Dec 12, 2025

Summary

  • search_language_pack: add NULL check after strdup(), fix unsafe realloc() that lost original pointer on failure
  • init_ocr: fix memory leak where ctx wasn't freed on early return when tessdata not found, add NULL checks for strdup() calls
  • ocr_bitmap: fix memory leak when pixCreate partially fails, add missing boxDestroy for crop_points on early return, add NULL checks for histogram/iot/mcit allocations, fix unsafe realloc() calls, add NULL check for text_out strdup
  • ocr_rect: add NULL check for copy allocation, initialize copy->data to NULL to prevent freep on uninitialized pointer, add NULL check for copy->data allocation
  • paraof_ocrtext: use fatal() on malloc failure for consistent OOM handling

All OOM conditions now use fatal(EXIT_NOT_ENOUGH_MEMORY, ...) following the project's coding patterns.

Test plan

  • Build succeeds
  • Run with OCR-enabled subtitle extraction to verify no regressions

🤖 Generated with Claude Code

cfsmp3 and others added 2 commits December 13, 2025 06:26
@cfsmp3 @claude
fix(ccx_encoders_spupng): add NULL checks and fix memory leaks
4d1d874 
This commit addresses multiple memory safety issues in ccx_encoders_spupng.c:

**NULL pointer dereference fixes (crash prevention):**

1. write_cc_bitmap_as_spupng() line 440: Added NULL check after malloc
   for pbuf - previously would crash on memset if allocation failed.

2. write_image() line 541: Added NULL check after malloc for row buffer
   with proper cleanup via goto finalise.

3. center_justify() line 611: Added NULL check after malloc for
   temp_buffer - previously would crash immediately on use.

4. utf8_to_utf32() line 718: Added NULL check after calloc for
   string_utf32 - previously would crash on use by iconv.

5. spupng_export_string2png() line 780: Fixed existing NULL check that
   printed error but did not return/exit - code would continue to
   memset(NULL, ...) causing a crash.

**Memory leak fixes:**

6. spupng_export_string2png() line 789: Fixed leak where buffer was not
   freed when strdup(str) failed and function returned early.

7. spupng_export_string2png() line 901: Fixed leak on realloc failure
   where buffer, tmp, and string_utf32 were leaked. Now properly frees
   all three before calling fatal().

All fatal() calls include diagnostic information (function name and
bytes requested where applicable) to aid debugging OOM conditions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
@cfsmp3 @claude
fix(ocr): add NULL checks and fix memory leaks
1342e4e 
- search_language_pack: add NULL check after strdup(), fix unsafe
  realloc() that lost original pointer on failure
- init_ocr: fix memory leak where ctx wasn't freed on early return
  when tessdata not found, add NULL checks for strdup() calls
- ocr_bitmap: fix memory leak when pixCreate partially fails, add
  missing boxDestroy for crop_points on early return, add NULL checks
  for histogram/iot/mcit allocations, fix unsafe realloc() calls,
  add NULL check for text_out strdup
- ocr_rect: add NULL check for copy allocation, initialize copy->data
  to NULL to prevent freep on uninitialized pointer, add NULL check
  for copy->data allocation
- paraof_ocrtext: use fatal() on malloc failure for consistent OOM
  handling

All OOM conditions now use fatal(EXIT_NOT_ENOUGH_MEMORY, ...) following
the project's coding patterns.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
@cfsmp3 cfsmp3 force-pushed the fix/ocr-memory-safety branch from e281cc9 to 1342e4e Compare December 13, 2025 05:27
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ccextractor-bot commented Dec 13, 2025

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit 77e1dff...:
Report Name Tests Passed
Broken 13/13
CEA-708 14/14
DVB 7/7
DVD 3/3
DVR-MS 2/2
General 27/27
Hardsubx 1/1
Hauppage 3/3
MP4 3/3
NoCC 10/10
Options 85/86
Teletext 21/21
WTV 13/13
XDS 34/34

NOTE: The following tests have been failing on the master branch as well as the PR:

Congratulations: Merging this PR would fix the following tests:

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  • ccextractor --autoprogram --out=srt --latin1 --ucla c8dc039a88..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 53339f3455..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 53339f3455..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 83b03036a2..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 83b03036a2..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7d3f25c32c..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 7d3f25c32c..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds f41d4c29a1..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla f41d4c29a1..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 88cd42b89a..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 88cd42b89a..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --output-field 2 --ucla 88cd42b89a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 7f41299cc7..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 0069dffd21..., Last passed: Never

All tests passing on the master branch were passed completely.

Check the result page for more info.

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ccextractor-bot commented Dec 13, 2025

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit 1510396...:
Report Name Tests Passed
Broken 13/13
CEA-708 14/14
DVB 7/7
DVD 3/3
DVR-MS 2/2
General 27/27
Hardsubx 1/1
Hauppage 3/3
MP4 3/3
NoCC 10/10
Options 86/86
Teletext 21/21
WTV 13/13
XDS 34/34

Congratulations: Merging this PR would fix the following tests:

  • ccextractor --autoprogram --out=srt --latin1 f1422b8bfe..., Last passed: Never
  • ccextractor --datapid 5603 --autoprogram --out=srt --latin1 --teletext 85c7fc1ad7..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2..., Last passed: Never
  • ccextractor --hardsubx 1a0302f7fd..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 c0d2fba8c0..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 006fdc391a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 e92a1d4d2a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 7e4ebf7fd7..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 9256a60e4b..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 27d7a43dd6..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 297a44921a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 efbe129086..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 eae0077731..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 e2e2b501e0..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 c6407fb294..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --datets dcada745de..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --tpage 398 5d5838bde9..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --teletext --tpage 398 3b276ad8bf..., Last passed: Never

All tests passing on the master branch were passed completely.

Check the result page for more info.

@cfsmp3 cfsmp3 merged commit 249cac3 into master Dec 13, 2025
29 of 30 checks passed
@cfsmp3 cfsmp3 deleted the fix/ocr-memory-safety branch December 19, 2025 06:03
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@cfsmp3 @ccextractor-bot