simple-scan-team team mailing list archive

[Stef Walter <stefw@xxxxxxxxx>]

Wonderful. Looking forward to getting this fixed. Simple scan is just
wonderful, modulo this bug :)

Yeah, the problem is that it seems to me harder to get contributors from
the wider community when using unfamiliar tools. Whether the perceptions
of how different or difficult bzr is, is waranted or not...

In my case I wanted to fix this several months ago, but just moved on
because of the bzr. Finally when I encountered this again, I installed
bzr, and it was surprisingly easy to figure out the two commands I
needed (branch and diff).

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Scan Development Team, which is the registrant for Simple Scan.
https://bugs.launchpad.net/bugs/931496

Title:
  Simple scan crashes when a PDF is saved

Status in Simple Scan:
  New

Bug description:
  When saving a PDF memory corruption occurs and simple scan crashes in
  random code (for me in the deflate functionality). Checked this using
  clean bzr checkout. BTW, I would have patched this much earlier if
  simple-scan was version control system that I was familiar with (like
  git) :S

  Can be verified with valgrind:

  ** WARNING **: scanner.vala:1204: Scan completed with 2250 lines, expected 2250 lines
  ==8804== Thread 1:
  ==8804== Invalid write of size 1
  ==8804==    at 0x40FCFA: book_save_pdf (book.c:1826)
  ==8804==    by 0x411F20: book_save (book.c:2533)
  ==8804==    by 0x44372F: simple_scan_save_document (ui.c:1638)
  ==8804==    by 0x447230: save_file_button_clicked_cb (ui.c:3002)
  ==8804==    by 0x66AFD53: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
  ==8804==    by 0x66ADF59: g_closure_invoke (gclosure.c:774)
  ==8804==    by 0x66C7C40: signal_emit_unlocked_R (gsignal.c:3302)
  ==8804==    by 0x66C6E51: g_signal_emit_valist (gsignal.c:3033)
  ==8804==    by 0x66C7507: g_signal_emit_by_name (gsignal.c:3127)
  ==8804==    by 0x4F14CBC: button_clicked (gtktoolbutton.c:881)
  ==8804==    by 0x66AFD53: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
  ==8804==    by 0x66ADF59: g_closure_invoke (gclosure.c:774)
  ==8804==  Address 0x2102c5c8 is 0 bytes after a block of size 711,000 alloc'd
  ==8804==    at 0x4A05BB4: calloc (vg_replace_malloc.c:467)
  ==8804==    by 0x6947193: standard_calloc (gmem.c:104)
  ==8804==    by 0x6947225: g_malloc0 (gmem.c:189)
  ==8804==    by 0x69474E2: g_malloc0_n (gmem.c:385)
  ==8804==    by 0x40F889: book_save_pdf (book.c:1674)
  ==8804==    by 0x411F20: book_save (book.c:2533)
  ==8804==    by 0x44372F: simple_scan_save_document (ui.c:1638)
  ==8804==    by 0x447230: save_file_button_clicked_cb (ui.c:3002)
  ==8804==    by 0x66AFD53: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
  ==8804==    by 0x66ADF59: g_closure_invoke (gclosure.c:774)
  ==8804==    by 0x66C7C40: signal_emit_unlocked_R (gsignal.c:3302)
  ==8804==    by 0x66C6E51: g_signal_emit_valist (gsignal.c:3033)
  ==8804== 
  ==8804== Invalid read of size 1
  ==8804==    at 0x40FD0C: book_save_pdf (book.c:1827)
  ==8804==    by 0x411F20: book_save (book.c:2533)
  ==8804==    by 0x44372F: simple_scan_save_document (ui.c:1638)
  ==8804==    by 0x447230: save_file_button_clicked_cb (ui.c:3002)
  ==8804==    by 0x66AFD53: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
  ==8804==    by 0x66ADF59: g_closure_invoke (gclosure.c:774)
  ==8804==    by 0x66C7C40: signal_emit_unlocked_R (gsignal.c:3302)
  ==8804==    by 0x66C6E51: g_signal_emit_valist (gsignal.c:3033)
  ==8804==    by 0x66C7507: g_signal_emit_by_name (gsignal.c:3127)
  ==8804==    by 0x4F14CBC: button_clicked (gtktoolbutton.c:881)
  ==8804==    by 0x66AFD53: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
  ==8804==    by 0x66ADF59: g_closure_invoke (gclosure.c:774)
  ==8804==  Address 0x2102c5c8 is 0 bytes after a block of size 711,000 alloc'd
  ==8804==    at 0x4A05BB4: calloc (vg_replace_malloc.c:467)
  ==8804==    by 0x6947193: standard_calloc (gmem.c:104)
  ==8804==    by 0x6947225: g_malloc0 (gmem.c:189)
  ==8804==    by 0x69474E2: g_malloc0_n (gmem.c:385)
  ==8804==    by 0x40F889: book_save_pdf (book.c:1674)
  ==8804==    by 0x411F20: book_save (book.c:2533)
  ==8804==    by 0x44372F: simple_scan_save_document (ui.c:1638)
  ==8804==    by 0x447230: save_file_button_clicked_cb (ui.c:3002)
  ==8804==    by 0x66AFD53: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
  ==8804==    by 0x66ADF59: g_closure_invoke (gclosure.c:774)
  ==8804==    by 0x66C7C40: signal_emit_unlocked_R (gsignal.c:3302)
  ==8804==    by 0x66C6E51: g_signal_emit_valist (gsignal.c:3033)
  ==8804== 

  The problem is that due to a integer rounding error, one byte less is
  allocated in the image buffer than there should be. I don't understand
  the code completely, so this patch should be verified by the original
  author of the code. Attached.

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