Bug 707344 - Flash() segfaults
Flash() segfaults
Status: CLOSED UPSTREAM
Product: Fedora
Classification: Fedora
Component: ncurses (Show other bugs)
14
x86_64 Linux
unspecified Severity low
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Assigned To: Miroslav Lichvar
Fedora Extras Quality Assurance
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Depends On:
Blocks:
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Reported: 2011-05-24 14:40 EDT by r3obh
Modified: 2011-05-30 10:01 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2011-05-30 06:16:15 EDT
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Description r3obh 2011-05-24 14:40:56 EDT
Description of problem:

$ cat foo.c && gcc foo.c -lcurses && ./a.out
#include <curses.h>

int main() {
  flash();
  return 0;
}
Segmentation fault (core dumped)


Version-Release number of selected component (if applicable):

ncurses-libs-5.7-9.20100703.fc14.x86_64

How reproducible:

Always
Comment 1 Thomas E. Dickey 2011-05-25 18:47:11 EDT
I can make it not dump core, but it won't flash since
curses is not initialized (man initscr, newterm).
Comment 2 Miroslav Lichvar 2011-05-26 06:40:10 EDT
I get the crash, with ncurses-5.9 the backtrace is:

70	    if (flash_screen) {
(gdb) bt
#0  0x00007ffff7bc13d1 in flash () at ../../ncurses/base/lib_flash.c:70
Comment 3 Thomas E. Dickey 2011-05-26 17:46:21 EDT
yes - but my point was that while I can modify ncurses to
avoid the core dump, the program will never function as
the reporter intended.  (I've made fixes of this sort before).
Comment 4 r3obh 2011-05-26 20:30:50 EDT
The doc says that on failure, the function does nothing and returns ERR.
Comment 5 Miroslav Lichvar 2011-05-30 06:16:15 EDT
This seems to be fixed in upstream patch 5.9-20110528. Thanks.
Comment 6 Thomas E. Dickey 2011-05-30 10:01:36 EDT
no problem.

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