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Don't blindly increase offsets by the return value of snprintf, if there

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wasn't enough space this will go off the end. Instead clamp to the
available space. Fixes crash reported by Julien Rebetez.
This commit is contained in:
nicm 2014-04-11 19:35:54 +00:00
parent 73c5a487c1
commit b8bda67f30
3 changed files with 24 additions and 12 deletions
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12
arguments.c
View File

@ -125,7 +125,7 @@ args_free(struct args *args)
size_t
args_print(struct args *args, char *buf, size_t len)
{
size_t off;
size_t off, used;
int i;
const char *quotes;
struct args_entry *entry;
@ -165,9 +165,12 @@ args_print(struct args *args, char *buf, size_t len)
quotes = "\"";
else
quotes = "";
off += xsnprintf(buf + off, len - off, "%s-%c %s%s%s",
used = xsnprintf(buf + off, len - off, "%s-%c %s%s%s",
off != 0 ? " " : "", entry->flag, quotes, entry->value,
quotes);
if (used > len - off)
used = len - off;
off += used;
}
/* And finally the argument vector. */
@ -181,8 +184,11 @@ args_print(struct args *args, char *buf, size_t len)
quotes = "\"";
else
quotes = "";
off += xsnprintf(buf + off, len - off, "%s%s%s%s",
used = xsnprintf(buf + off, len - off, "%s%s%s%s",
off != 0 ? " " : "", quotes, args->argv[i], quotes);
if (used > len - off)
used = len - off;
off += used;
}
return (off);

10
cmd-list.c
View File

@ -103,7 +103,7 @@ size_t
cmd_list_print(struct cmd_list *cmdlist, char *buf, size_t len)
{
struct cmd *cmd;
size_t off;
size_t off, used;
off = 0;
TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
@ -112,8 +112,12 @@ cmd_list_print(struct cmd_list *cmdlist, char *buf, size_t len)
off += cmd_print(cmd, buf + off, len - off);
if (off >= len)
break;
if (TAILQ_NEXT(cmd, qentry) != NULL)
off += xsnprintf(buf + off, len - off, " ; ");
if (TAILQ_NEXT(cmd, qentry) != NULL) {
used = xsnprintf(buf + off, len - off, " ; ");
if (used > len - off)
used = len - off;
off += used;
}
}
return (off);
}

14
window-copy.c
View File

@ -1194,8 +1194,8 @@ window_copy_write_line(
screen_write_puts(ctx, &gc, "%s", hdr);
} else if (py == last && data->inputtype != WINDOW_COPY_OFF) {
limit = sizeof hdr;
if (limit > screen_size_x(s))
limit = screen_size_x(s);
if (limit > screen_size_x(s) + 1)
limit = screen_size_x(s) + 1;
if (data->inputtype == WINDOW_COPY_NUMERICPREFIX) {
xoff = size = xsnprintf(hdr, limit,
"Repeat: %u", data->numprefix);
@ -1208,10 +1208,12 @@ window_copy_write_line(
} else
size = 0;
screen_write_cursormove(ctx, xoff, py);
screen_write_copy(ctx, data->backing, xoff,
(screen_hsize(data->backing) - data->oy) + py,
screen_size_x(s) - size, 1);
if (size < screen_size_x(s)) {
screen_write_cursormove(ctx, xoff, py);
screen_write_copy(ctx, data->backing, xoff,
(screen_hsize(data->backing) - data->oy) + py,
screen_size_x(s) - size, 1);
}
if (py == data->cy && data->cx == screen_size_x(s)) {
memcpy(&gc, &grid_default_cell, sizeof gc);