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ivshmem: fix incorrect error handling in ivshmem_recv_msg() 

Screwed up in commit 3a55fc0f, v2.6.0.

If qemu_chr_fe_read_all() returns -EINTR the do {} statement continues and the
n accumulator used to complete reads upto sizeof(msg) is decremented by 4 (the
value of EINTR on Linux).
To avoid that, use simpler if() statements and continue if EINTR occured.

hw/misc/ivshmem.c:650:14: warning: Loss of sign in implicit conversion
    } while (n < sizeof(msg));
             ^

Reported-by: Clang Static Analyzer
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
master
Philippe Mathieu-Daudé 2017-07-26 23:42:08 -03:00 committed by Michael Tokarev
parent 2a4e2e4919
commit b7b1e9dd6d
1 changed files with 4 additions and 1 deletions
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5
hw/misc/ivshmem.c
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@ -642,7 +642,10 @@ static int64_t ivshmem_recv_msg(IVShmemState *s, int *pfd, Error **errp)
do {
ret = qemu_chr_fe_read_all(&s->server_chr, (uint8_t *)&msg + n,
sizeof(msg) - n);
if (ret < 0 && ret != -EINTR) {
if (ret < 0) {
if (ret == -EINTR) {
continue;
}
error_setg_errno(errp, -ret, "read from server failed");
return INT64_MIN;
}