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invoke_swaybar: fix message length header size

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size_t/ssize_t are 8 bytes on 64bit systems, so use the proper size to
transmit that information.
This could lead to ridiculously large alloc as len is not initialized to zero

Found through static analysis
This commit is contained in:
Dominique Martinet 2018-06-30 16:49:13 +09:00
parent 1b7f554474
commit 9c8fb7d025
1 changed files with 3 additions and 3 deletions
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6
sway/config/bar.c
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@ -174,7 +174,7 @@ void invoke_swaybar(struct bar_config *bar) {
if (!command) {
const char msg[] = "Unable to allocate swaybar command string";
size_t msg_len = sizeof(msg);
if (write(filedes[1], &msg_len, sizeof(int))) {};
if (write(filedes[1], &msg_len, sizeof(size_t))) {};
if (write(filedes[1], msg, msg_len)) {};
close(filedes[1]);
exit(1);
@ -189,8 +189,8 @@ void invoke_swaybar(struct bar_config *bar) {
}
wlr_log(L_DEBUG, "Spawned swaybar %d", bar->pid);
close(filedes[0]);
ssize_t len;
if (read(filedes[1], &len, sizeof(int)) == sizeof(int)) {
size_t len;
if (read(filedes[1], &len, sizeof(size_t)) == sizeof(size_t)) {
char *buf = malloc(len);
if(!buf) {
wlr_log(L_ERROR, "Cannot allocate error string");