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Do not write before buffer when parsing empty clipboard or palette

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replies, or try to allocate zero bytes with an empty clipboard sequence.
Reported by DongHan Kim.
This commit is contained in:
nicm
2026-02-11 08:23:21 +00:00
parent 7d41761e84
commit 5b455abecc
1 changed files with 13 additions and 3 deletions
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16
tty-keys.c
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@@ -1377,6 +1377,10 @@ tty_keys_clipboard(struct tty *tty, const char *buf, size_t len, size_t *size)
/* Convert from base64. */
needed = (end / 4) * 3;
if (needed == 0) {
free(copy);
return (0);
}
out = xmalloc(needed);
if ((outlen = b64_pton(copy, out, len)) == -1) {
free(out);
@@ -1612,8 +1616,10 @@ tty_keys_extended_device_attributes(struct tty *tty, const char *buf,
}
if (i == (sizeof tmp) - 1)
return (-1);
tmp[i - 1] = '\0';
*size = 5 + i;
if (i == 0)
return (0);
tmp[i - 1] = '\0';
/* Add terminal features. */
if (strncmp(tmp, "iTerm2 ", 7) == 0)
@@ -1686,11 +1692,13 @@ tty_keys_colours(struct tty *tty, const char *buf, size_t len, size_t *size,
}
if (i == (sizeof tmp) - 1)
return (-1);
*size = 6 + i;
if (i == 0)
return (0);
if (tmp[i - 1] == '\033')
tmp[i - 1] = '\0';
else
tmp[i] = '\0';
*size = 6 + i;
/* Work out the colour. */
n = colour_parseX11(tmp);
@@ -1755,11 +1763,13 @@ tty_keys_palette(struct tty *tty, const char *buf, size_t len, size_t *size)
}
if (i == (sizeof tmp) - 1)
return (-1);
*size = 5 + i;
if (i == 0)
return (0);
if (tmp[i - 1] == '\033')
tmp[i - 1] = '\0';
else
tmp[i] = '\0';
*size = 5 + i;
/* Parse index. */
idx = strtol(tmp, &endptr, 10);