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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 c21ca2a696
commit ea5a709924
2 changed files with 3 additions and 1 deletions
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2
NEWS
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@ -77,6 +77,7 @@ The following bugs are resolved with this release:
[26643] register x8 and quad sized NEON registers are not properly
saved when using ld_audit on aarch64
[27576] gmon: improve mcount overflow handling
[27821] ungetc: Fix backup buffer leak on program exit
[28036] Incorrect types for pthread_mutexattr_set/getrobust_np
[28061] dynamic-link: A failing dlmopen called by an auditor crashed
[28062] dynamic-link: Suppress audit calls when a (new) namespace is
@ -169,6 +170,7 @@ The following bugs are resolved with this release:
[31476] resolv: Track single-request fallback via _res._flags
[31890] resolv: Allow short error responses to match any DNS query
[32052] Name space violation in fortify wrappers
[32137] libio: Attempt wide backup free only for non-legacy code
Version 2.34

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)