From: Mark Rustad Date: Sat, 14 Jul 2012 01:18:04 +0000 (-0700) Subject: tcm_fc: Fix crash seen with aborts and large reads X-Git-Tag: v3.2.24~52 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=60d448613a4cf0b8e70c0d16abc6a6baf31ab9b5;p=karo-tx-linux.git tcm_fc: Fix crash seen with aborts and large reads commit 3cc5d2a6b9a2fd1bf024aa5e52dd22961eecaf13 upstream. This patch fixes a crash seen when large reads have their exchange aborted by either timing out or being reset. Because the exchange abort results in the seq pointer being set to NULL, because the sequence is no longer valid, it must not be dereferenced. This patch changes the function ft_get_task_tag to return ~0 if it is unable to get the tag for this reason. Because the get_task_tag interface provides no means of returning an error, this seems like the best way to fix this issue at the moment. Signed-off-by: Mark Rustad Signed-off-by: Nicholas Bellinger Signed-off-by: Ben Hutchings --- diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c index d95cfe2eb48c..278819c60dc5 100644 --- a/drivers/target/tcm_fc/tfc_cmd.c +++ b/drivers/target/tcm_fc/tfc_cmd.c @@ -249,6 +249,8 @@ u32 ft_get_task_tag(struct se_cmd *se_cmd) { struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd); + if (cmd->aborted) + return ~0; return fc_seq_exch(cmd->seq)->rxid; }