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authorNicholas Bellinger <nab@linux-iscsi.org>2012-05-21 04:10:29 +0400
committerNicholas Bellinger <nab@linux-iscsi.org>2012-05-21 04:25:24 +0400
commitf80e8ed3951455272c12693e35b259be8eb60b30 (patch)
tree0b348e90da1ce8e98d45346084ad2a1be47cbc78 /drivers/target
parentb1e41d8cd43910fee82f27ab1381bc6cd66910b3 (diff)
downloadlinux-f80e8ed3951455272c12693e35b259be8eb60b30.tar.xz
iscsi-target: Fix iov_count calculation bug in iscsit_allocate_iovecs
This patch fixes a bug in iscsit_allocate_iovecs() where iov_count was incorrectly calculated using min(1UL, data_length / PAGE_SIZE) instead of max(1UL, data_length / PAGE_SIZE), that ends up triggering an OOPs for large block I/O when the SGL <-> iovec mapping exceeds the bogus iov_count allocation size. This is a regression introduced during the iscsi-target conversion back to using core memory allocation here: commit bfb79eac2026b411df9e253a9c350039b4b04bb7 Author: Andy Grover <agrover@redhat.com> Date: Tue Apr 3 15:51:29 2012 -0700 target/iscsi: Go back to core allocating data buffer for cmd Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/iscsi/iscsi_target.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index e39947105ab1..d57d10cb2e47 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -760,7 +760,7 @@ static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
{
- u32 iov_count = min(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
+ u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
iov_count += ISCSI_IOV_DATA_BUFFER;