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authorArnd Bergmann <arnd@arndb.de>2018-04-12 18:16:07 +0300
committerJens Axboe <axboe@kernel.dk>2018-04-12 18:58:27 +0300
commit6038aa532a224da68c478f34f4dbce33c47169e6 (patch)
treeffb4f254e2d8a39ee400ea903e301a5b4aea269b /drivers/nvme/target
parent74c6c71530847808d4e3be7b205719270efee80c (diff)
downloadlinux-6038aa532a224da68c478f34f4dbce33c47169e6.tar.xz
nvme: target: fix buffer overflow
nvmet_execute_get_disc_log_page() passes a fixed-length string into nvmet_format_discovery_entry(), which then does a longer memcpy() on it, as pointed out by gcc-8: In function 'nvmet_format_discovery_entry', inlined from 'nvmet_execute_get_disc_log_page' at drivers/nvme/target/discovery.c:126:4: drivers/nvme/target/discovery.c:62:2: error: 'memcpy' forming offset [38, 223] is out of the bounds [0, 37] [-Werror=array-bounds] memcpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE); Using strncpy() will make this well-defined, filling the rest of the buffer with zeroes, under the assumption that the input is either a NUL-terminated string, or a byte sequence containing no zeroes. If the input is a string that is longer than NVMF_NQN_SIZE, we continue to have no NUL-termination in the output. Fixes: a07b4970f464 ("nvmet: add a generic NVMe target") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/nvme/target')
-rw-r--r--drivers/nvme/target/discovery.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c
index a72425d8bce0..231e04e0a496 100644
--- a/drivers/nvme/target/discovery.c
+++ b/drivers/nvme/target/discovery.c
@@ -59,7 +59,7 @@ static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
memcpy(e->traddr, traddr, NVMF_TRADDR_SIZE);
memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
- memcpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
+ strncpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
}
/*