BBS: TELESC.NET.BR
Assunto: New Defects reported by Coverity Scan for Synchronet
De: scan-admin@coverity.com
Data: Sun, 15 Mar 2026 14:04:34 +0000
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Hi,
Please find the latest report on new defect(s) introduced to Synchronet found with Coverity Scan.
3 new defect(s) introduced to Synchronet found with Coverity Scan.
New defect(s) Reported-by: Coverity Scan
Showing 3 of 3 defect(s)
** CID 644904: Concurrent data access violations (MISSING_LOCK)
/tmp/sbbs-Mar-15-2026/src/conio/bitmap_con.c: 1139 in blinker_thread()
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*** CID 644904: Concurrent data access violations (MISSING_LOCK)
/tmp/sbbs-Mar-15-2026/src/conio/bitmap_con.c: 1139 in blinker_thread()
1133 assert_pthread_mutex_unlock(&screenlock);
1134 assert_rwlock_unlock(&vstatlock);
1135 continue;
1136 }
1137 assert_pthread_mutex_unlock(&screenlock);
1138 if (curs_changed || blink_changed || lfc)
>>> CID 644904: Concurrent data access violations (MISSING_LOCK)
>>> Accessing "vstat.vmem->changed" without holding lock "vstat_chlock". Elsewhere, "vstat_vmem.changed" is written to with "vstat_chlock" held 7 out of 8 times (6 of these accesses strongly imply that it is necessary).
1139 vstat.vmem->changed = true;
1140 assert_rwlock_unlock(&vstatlock);
1141
1142 if (check_redraw()) {
1143 if (update_from_vmem(TRUE))
1144 request_redraw();
** CID 644903: Concurrent data access violations (MISSING_LOCK)
/tmp/sbbs-Mar-15-2026/src/conio/bitmap_con.c: 861 in draw_char_row_slow()
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*** CID 644903: Concurrent data access violations (MISSING_LOCK)
/tmp/sbbs-Mar-15-2026/src/conio/bitmap_con.c: 861 in draw_char_row_slow()
855 ac = cs->bg;
856 bc = cs->bg;
857 }
858
859 if (screena.rect->data[pixeloffset] != ac) {
860 screena.rect->data[pixeloffset] = ac;
>>> CID 644903: Concurrent data access violations (MISSING_LOCK)
>>> Accessing "screena.update_pixels" without holding lock "screenlock". Elsewhere, "bitmap_screen.update_pixels" is written to with "screenlock" held 18 out of 24 times.
861 screena.update_pixels = 1;
862 }
863 if (screenb.rect->data[pixeloffset] != bc) {
864 screenb.rect->data[pixeloffset] = bc;
865 screenb.update_pixels = 1;
866 }
** CID 644905: Concurrent data access violations (MISSING_LOCK)
/tmp/sbbs-Mar-15-2026/src/conio/bitmap_con.c: 988 in bitmap_draw_vmem_locked()
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*** CID 644905: Concurrent data access violations (MISSING_LOCK)
/tmp/sbbs-Mar-15-2026/src/conio/bitmap_con.c: 988 in bitmap_draw_vmem_locked()
982 bs.pixeloffset += rsz;
983 if (bs.pixeloffset >= bs.maxpix)
984 bs.pixeloffset -= bs.maxpix;
985 }
986 }
987 if (didfast) {
>>> CID 644905: Concurrent data access violations (MISSING_LOCK)
>>> Accessing "screena.update_pixels" without holding lock "screenlock". Elsewhere, "bitmap_screen.update_pixels" is written to with "screenlock" held 18 out of 24 times.
988 screena.update_pixels = true;
989 screenb.update_pixels = true;
990 }
991 }
992 }
993
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To view the defects in Coverity Scan visit, https://scan.coverity.com/projects/synchronet?tab=overview
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