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libzfs: sendrecv: fix NULL arithmetic UB 

Reviewed-by: Alejandro Colomar <alx.manpages@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13110
This commit is contained in:
наб 2022-02-16 15:29:01 +01:00 committed by Brian Behlendorf
parent 46c7a80280
commit 5cf3c24fd8
1 changed files with 4 additions and 2 deletions
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6
lib/libzfs/libzfs_sendrecv.c
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@ -294,11 +294,13 @@ send_iterate_snap(zfs_handle_t *zhp, void *arg)
uint64_t guid = zhp->zfs_dmustats.dds_guid;
uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
boolean_t isfromsnap, istosnap, istosnapwithnofrom;
char *snapname = strrchr(zhp->zfs_name, '@') + 1;
char *snapname;
const char *from = sd->fromsnap;
const char *to = sd->tosnap;
assert(snapname != (NULL + 1));
snapname = strrchr(zhp->zfs_name, '@');
assert(snapname != NULL);
++snapname;
isfromsnap = (from != NULL && strcmp(from, snapname) == 0);
istosnap = (to != NULL && strcmp(to, snapname) == 0);