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xcb_conn: Add a check for NULL to silence a UBSan runtime error 

xcb_conn.c:314:60: runtime error: applying zero offset to null pointer

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
This commit is contained in:
Jeremy Huddleston Sequoia 2022-11-26 14:55:07 -08:00
parent 33f3dbe369
commit cb8c70f5a6
Failed to extract signature
1 changed files with 5 additions and 3 deletions
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8
src/xcb_conn.c
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@ -310,9 +310,11 @@ static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
int cur = (*vector)->iov_len; int cur = (*vector)->iov_len;
if(cur > n) if(cur > n)
cur = n; cur = n;
(*vector)->iov_len -= cur; if(cur) {
(*vector)->iov_base = (char *) (*vector)->iov_base + cur; (*vector)->iov_len -= cur;
n -= cur; (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
n -= cur;
}
if((*vector)->iov_len) if((*vector)->iov_len)
break; break;
} }