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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2024-02-04 16:57:36 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-03-07 21:51:12 +0000 |
| commit | b6c8dafc9d86eb77e502bb018ec4105e8d2fbf78 (patch) | |
| tree | 5617f43d856f4c30289c861ac1159ed04ef14882 /drivers/accessibility | |
| parent | 813f008d4343bd5ecc14790cf98ad24deb7e8d2d (diff) | |
| download | linux-b6c8dafc9d86eb77e502bb018ec4105e8d2fbf78.tar.gz | |
speakup: Fix 8bit characters from direct synth
When userland echoes 8bit characters to /dev/synth with e.g.
echo -e '\xe9' > /dev/synth
synth_write would get characters beyond 0x7f, and thus negative when
char is signed. When given to synth_buffer_add which takes a u16, this
would sign-extend and produce a U+ffxy character rather than U+xy.
Users thus get garbled text instead of accents in their output.
Let's fix this by making sure that we read unsigned characters.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Fixes: 89fc2ae80bb1 ("speakup: extend synth buffer to 16bit unicode characters")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240204155736.2oh4ot7tiaa2wpbh@begin
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/accessibility')
| -rw-r--r-- | drivers/accessibility/speakup/synth.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/accessibility/speakup/synth.c b/drivers/accessibility/speakup/synth.c index eea2a2fa4f015..45f9061031338 100644 --- a/drivers/accessibility/speakup/synth.c +++ b/drivers/accessibility/speakup/synth.c @@ -208,8 +208,10 @@ void spk_do_flush(void) wake_up_process(speakup_task); } -void synth_write(const char *buf, size_t count) +void synth_write(const char *_buf, size_t count) { + const unsigned char *buf = (const unsigned char *) _buf; + while (count--) synth_buffer_add(*buf++); synth_start(); |