From: Evgeny Yakovlev Date: Fri, 29 Jul 2016 09:48:25 +0000 (+0300) Subject: migration: mmap error check fix X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0e8b3cdfbc167f4bb7790ef744eaa1ac0e6959f9;p=qemu.git migration: mmap error check fix mmap man page: "On success, mmap() returns a pointer to the mapped area. On error, the value MAP_FAILED (that is, (void *) -1) is returned, and errno is set to indicate the cause of the error." The check in postcopy_get_tmp_page is definitely wrong and should be fixed. Signed-off-by: Evgeny Yakovlev Signed-off-by: Denis V. Lunev Reviewed-by: Amit Shah Reviewed-by: Dr. David Alan Gilbert CC: Juan Quintela CC: Amit Shah Message-Id: <1469785705-16670-1-git-send-email-den@openvz.org> Signed-off-by: Amit Shah --- diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index abe8c60a90..9b0477835f 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -604,7 +604,8 @@ void *postcopy_get_tmp_page(MigrationIncomingState *mis) mis->postcopy_tmp_page = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (!mis->postcopy_tmp_page) { + if (mis->postcopy_tmp_page == MAP_FAILED) { + mis->postcopy_tmp_page = NULL; error_report("%s: %s", __func__, strerror(errno)); return NULL; }