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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-05-20 17:10:29 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-05-20 17:25:24 -0700 |
| commit | f80e8ed3951455272c12693e35b259be8eb60b30 (patch) | |
| tree | 0b348e90da1ce8e98d45346084ad2a1be47cbc78 /drivers/target/iscsi | |
| parent | b1e41d8cd43910fee82f27ab1381bc6cd66910b3 (diff) | |
| download | linux-f80e8ed3951455272c12693e35b259be8eb60b30.tar.gz linux-f80e8ed3951455272c12693e35b259be8eb60b30.tar.xz linux-f80e8ed3951455272c12693e35b259be8eb60b30.zip | |
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/iscsi')
| -rw-r--r-- | drivers/target/iscsi/iscsi_target.c | 2 |
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; |