From 4f30c1bb8c32374c62f90abb5aa224611c59c363 Mon Sep 17 00:00:00 2001 From: Michal Privoznik Date: Sat, 6 Mar 2021 11:47:59 +0100 Subject: [PATCH] virDevMapperGetTargetsImpl: Use correct length when copying into dm.name MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit For reasons unknown, when rewriting this code and dropping libdevmapper I've mistakenly used incorrect length of dm.name. In linux/dm-ioctl.h the dm_ioctl struct is defined as follows: #define DM_NAME_LEN 128 struct dm_ioctl { ... char name[DM_NAME_LEN]; /* device name */ ... }; However, when copying string into this member, DM_TABLE_DEPS was used, which is defined as follows: #define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl) After decryption, this results in the following size: 3241737483. Fixes: 22494556542c676d1b9e7f1c1f2ea13ac17e1e3e Signed-off-by: Michal Privoznik Reviewed-by: Daniel P. Berrangé --- src/util/virdevmapper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/util/virdevmapper.c b/src/util/virdevmapper.c index fcb11e954f..2c4c2df999 100644 --- a/src/util/virdevmapper.c +++ b/src/util/virdevmapper.c @@ -240,7 +240,7 @@ virDevMapperGetTargetsImpl(int controlFD, if (!(sanitizedPath = virDMSanitizepath(path))) return 0; - if (virStrcpy(dm.name, sanitizedPath, DM_TABLE_DEPS) < 0) { + if (virStrcpy(dm.name, sanitizedPath, DM_NAME_LEN) < 0) { virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", _("Resolved device mapper name too long")); return -1;