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memory: prevent a use-after-free when the user respects a lock file

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This fixes https://savannah.gnu.org/bugs/?60447.

Bug existed since commit 2f718e11 from a month ago.
This commit is contained in:
Benno Schulenberg 2021-04-23 12:20:45 +02:00
parent af90f03ac5
commit 6283557d2f
1 changed files with 4 additions and 4 deletions
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8
src/files.c
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@ -603,14 +603,14 @@ void close_buffer(void)
free(orphan->errormessage); free(orphan->errormessage);
openfile = orphan->prev; openfile = orphan->prev;
if (openfile == orphan)
openfile = NULL;
free(orphan); free(orphan);
/* When just one buffer remains open, show "Exit" in the help lines. */ /* When just one buffer remains open, show "Exit" in the help lines. */
if (openfile == openfile->next) if (openfile && openfile == openfile->next)
exitfunc->desc = exit_tag; exitfunc->desc = exit_tag;
if (openfile == orphan)
openfile = NULL;
} }
#endif /* ENABLE_MULTIBUFFER */ #endif /* ENABLE_MULTIBUFFER */