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target: fix NULL pointer dereference bug alloc_page() fails to get memory 

I am hitting this bug when the target is low in memory that fails the
alloc_page() for the newly submitted command. This is a sort of off-by-one
bug causing NULL pointer dereference in __free_page() since 'i' here is
really the counter of total pages that have been successfully allocated here.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: Open-FCoE.org <devel@open-fcoe.org>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Yi Zou 2012-08-14 16:06:43 -07:00 committed by Nicholas Bellinger
parent 1fa8f45041
commit d0e27c88d7
1 changed files with 2 additions and 2 deletions
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4
drivers/target/target_core_transport.c
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@ -2294,9 +2294,9 @@ transport_generic_get_mem(struct se_cmd *cmd)
return 0;
out:
while (i >= 0) {
__free_page(sg_page(&cmd->t_data_sg[i]));
while (i > 0) {
i--;
__free_page(sg_page(&cmd->t_data_sg[i]));
}
kfree(cmd->t_data_sg);
cmd->t_data_sg = NULL;