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| author |   Florian Weimer <fweimer@redhat.com> | 2024-01-02 14:36:17 +0100 |
|---|---|---|
| committer |   Andreas K. Hüttel <dilfridge@gentoo.org> | 2024-01-30 19:12:43 +0100 |
| commit | 33c5167b00c38bb6a4db599f079600eb45b51bd0 (patch) | |
| tree | 4cea03d195287c03a7ade07201f30f3206e4bd8f | |
| parent | getaddrinfo: translate ENOMEM to EAI_MEMORY (bug 31163) (diff) | |
| download | glibc-33c5167b00c38bb6a4db599f079600eb45b51bd0.tar.gz glibc-33c5167b00c38bb6a4db599f079600eb45b51bd0.tar.bz2 glibc-33c5167b00c38bb6a4db599f079600eb45b51bd0.zip | |
libio: Check remaining buffer size in _IO_wdo_write (bug 31183)
The multibyte character needs to fit into the remaining buffer space,
not the already-written buffer space. Without the fix, we were never
moving the write pointer from the start of the buffer, always using
the single-character fallback buffer.
Fixes commit 04b76b5aa8b2d1d19066e42dd1 ("Don't error out writing
a multibyte character to an unbuffered stream (bug 17522)").
(cherry picked from commit ecc7c3deb9f347649c2078fcc0f94d4cedf92d60)
(cherry picked from commit cfe121910013a46e2477562282c56ae8062089aa)
| -rw-r--r-- | NEWS | 1 | ||||
| -rw-r--r-- | libio/wfileops.c | 2 |
2 files changed, 2 insertions, 1 deletions
@@ -43,6 +43,7 @@ The following bugs are resolved with this release: -D_FILE_OFFSET_BITS=64 [30842] Stack read overflow in getaddrinfo in no-aaaa mode (CVE-2023-4527) [30843] potential use-after-free in getcanonname (CVE-2023-4806) + [31183] Wide stream buffer size reduced MB_LEN_MAX bytes after bug 17522 fix [31184] FAIL: elf/tst-tlsgap [31185] Incorrect thread point access in _dl_tlsdesc_undefweak and _dl_tlsdesc_dynamic diff --git a/libio/wfileops.c b/libio/wfileops.c index f16f6db1c3..9ab8f2e7f3 100644 --- a/libio/wfileops.c +++ b/libio/wfileops.c @@ -55,7 +55,7 @@ _IO_wdo_write (FILE *fp, const wchar_t *data, size_t to_do) char mb_buf[MB_LEN_MAX]; char *write_base, *write_ptr, *buf_end; - if (fp->_IO_write_ptr - fp->_IO_write_base < sizeof (mb_buf)) + if (fp->_IO_buf_end - fp->_IO_write_ptr < sizeof (mb_buf)) { /* Make sure we have room for at least one multibyte character. */ |