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libio: Attempt wide backup free only for non-legacy code

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_wide_data and _mode are not available in legacy code, so do not attempt
to free the wide backup buffer in legacy code.

Resolves: BZ #32137 and BZ #27821

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit ae4d44b1d5)
This commit is contained in:
Siddhesh Poyarekar 2024-09-03 14:58:33 -04:00 committed by Florian Weimer
parent c3a3240b64
commit 485b2a773d
2 changed files with 3 additions and 1 deletions
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2
NEWS
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@ -52,6 +52,7 @@ The following bugs are resolved with this release:
[20975] Deferred cancellation triggers in __check_pf and looses lock leading to deadlock
[24816] Fix tst-nss-files-hosts-long on single-stack hosts
[27576] gmon: improve mcount overflow handling
[27821] ungetc: Fix backup buffer leak on program exit
[28846] CMSG_NXTHDR may trigger -Wstrict-overflow warning
[29039] Corrupt DTV after reuse of a TLS module ID following dlclose with unused TLS
[29444] gmon: Fix allocated buffer overflow (bug 29444)
@ -103,6 +104,7 @@ The following bugs are resolved with this release:
[31965] rseq extension mechanism does not work as intended
[31968] mremap implementation in C does not handle arguments correctly
[32052] Name space violation in fortify wrappers
[32137] libio: Attempt wide backup free only for non-legacy code
Version 2.36

2
libio/genops.c
View File

@ -799,7 +799,7 @@ _IO_unbuffer_all (void)
/* Free up the backup area if it was ever allocated. */
if (_IO_have_backup (fp))
_IO_free_backup_area (fp);
if (fp->_mode > 0 && _IO_have_wbackup (fp))
if (!legacy && fp->_mode > 0 && _IO_have_wbackup (fp))
_IO_free_wbackup_area (fp);
if (! (fp->_flags & _IO_UNBUFFERED)