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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
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@ -294,11 +294,13 @@ send_iterate_snap(zfs_handle_t *zhp, void *arg)
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uint64_t guid = zhp->zfs_dmustats.dds_guid;
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uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
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boolean_t isfromsnap, istosnap, istosnapwithnofrom;
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char *snapname = strrchr(zhp->zfs_name, '@') + 1;
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char *snapname;
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const char *from = sd->fromsnap;
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const char *to = sd->tosnap;
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assert(snapname != (NULL + 1));
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snapname = strrchr(zhp->zfs_name, '@');
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assert(snapname != NULL);
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++snapname;
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isfromsnap = (from != NULL && strcmp(from, snapname) == 0);
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istosnap = (to != NULL && strcmp(to, snapname) == 0);
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