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connection: fix asan report on sendmsg call

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Initialiaze the entire msghdr struct to 0 before use.

Example of the report fixed with this change:

AddressSanitizer:DEADLYSIGNAL
=================================================================
==20035==ERROR: AddressSanitizer: SEGV on unknown address 0x2dad4dbffffa0d (pc 0x0055555c7488 bp 0x007fffffc760 sp 0x007fffffc760 T0)
==20035==The signal is caused by a READ memory access.
    #0 0x55555c7488 in read_msghdr(void*, __sanitizer::__sanitizer_msghdr*, long) (/home/ftrvx/w/_/uxn/bin/uxnemu+0x77488)
    #1 0x55555c810c in sendmsg (/home/ftrvx/w/_/uxn/bin/uxnemu+0x7810c)
    #2 0x7ff7f2db20 in wl_connection_flush /home/ftrvx/q/wayland/build/../src/connection.c:315:10
    #3 0x7ff7f2d014 in wl_display_flush /home/ftrvx/q/wayland/build/../src/wayland-client.c:2154:9
    #4 0x7ff7e80bc0  (/lib/libSDL2-2.0.so.0+0x104bc0)
    #5 0x7ff7e523b0  (/lib/libSDL2-2.0.so.0+0xd63b0)
    #6 0x7ff7e534e4  (/lib/libSDL2-2.0.so.0+0xd74e4)
    #7 0x7ff7e535e8  (/lib/libSDL2-2.0.so.0+0xd75e8)
    #8 0x7ff7daad54  (/lib/libSDL2-2.0.so.0+0x2ed54)
    #9 0x7ff7dab130  (/lib/libSDL2-2.0.so.0+0x2f130)
    #10 0x555565bb40 in main /home/ftrvx/w/_/uxn/src/uxnemu.c:519:2
    #11 0x7ff7f62484 in libc_start_main_stage2 /builddir/musl-1.1.24/src/env/__libc_start_main.c:94:2

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/ftrvx/w/_/uxn/bin/uxnemu+0x77488) in read_msghdr(void*, __sanitizer::__sanitizer_msghdr*, long)
==20035==ABORTING

Signed-off-by: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
This commit is contained in:
Sigrid Solveig Haflínudóttir 2022-03-29 17:59:15 +02:00 • committed by Simon Ser
parent de57106c94
commit d066c4bd4e
1 changed files with 1 additions and 4 deletions
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5
src/connection.c
View file

@ -289,7 +289,7 @@ int
wl_connection_flush(struct wl_connection *connection)
{
struct iovec iov[2];
struct msghdr msg;
struct msghdr msg = {0};
char cmsg[CLEN];
int len = 0, count, clen;
uint32_t tail;
@ -303,13 +303,10 @@ wl_connection_flush(struct wl_connection *connection)
build_cmsg(&connection->fds_out, cmsg, &clen);
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = count;
msg.msg_control = (clen > 0) ? cmsg : NULL;
msg.msg_controllen = clen;
msg.msg_flags = 0;
do {
len = sendmsg(connection->fd, &msg,