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virDevMapperGetTargetsImpl: Use correct length when copying into dm.name

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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: 2249455654
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Michal Privoznik 2021-03-06 11:47:59 +01:00
parent d5b2644815
commit 4f30c1bb8c
1 changed files with 1 additions and 1 deletions
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2
src/util/virdevmapper.c
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@ -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;