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speakup: Avoid crash on very long word

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commit c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1 upstream.

In case a console is set up really large and contains a really long word
(> 256 characters), we have to stop before the length of the word buffer.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Fixes: c6e3fd22cd538 ("Staging: add speakup to the staging directory")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240323164843.1426997-1-samuel.thibault@ens-lyon.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Thibault 2024-03-23 17:48:43 +01:00 committed by Ksawlii
parent aaf76528e8
commit 678af05779
1 changed files with 1 additions and 1 deletions
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2
drivers/accessibility/speakup/main.c
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@ -576,7 +576,7 @@ static u_long get_word(struct vc_data *vc)
}
attr_ch = get_char(vc, (u_short *)tmp_pos, &spk_attr);
buf[cnt++] = attr_ch;
while (tmpx < vc->vc_cols - 1) {
while (tmpx < vc->vc_cols - 1 && cnt < sizeof(buf) - 1) {
tmp_pos += 2;
tmpx++;
ch = get_char(vc, (u_short *)tmp_pos, &temp);