[PATCH 3.19.y-ckt 30/99] thunderbolt: Fix double free of drom buffer

From: Kamal Mostafa
Date: Thu Jul 07 2016 - 14:58:12 EST


3.19.8-ckt23 -stable review patch. If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Andreas Noever <andreas.noever@xxxxxxxxx>

commit 2ffa9a5d76a75abbc1f95c17959fced666095bdd upstream.

If tb_drom_read() fails, sw->drom is freed but not set to NULL. sw->drom
is then freed again in the error path of tb_switch_alloc().

The bug can be triggered by unplugging a thunderbolt device shortly after
it is detected by the thunderbolt driver.

Clear sw->drom if tb_drom_read() fails.

[bhelgaas: add Fixes:, stable versions of interest]
Fixes: 343fcb8c70d7 ("thunderbolt: Fix nontrivial endpoint devices.")
Signed-off-by: Andreas Noever <andreas.noever@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
CC: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/thunderbolt/eeprom.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c
index 0dde34e..545c60c 100644
--- a/drivers/thunderbolt/eeprom.c
+++ b/drivers/thunderbolt/eeprom.c
@@ -444,6 +444,7 @@ int tb_drom_read(struct tb_switch *sw)
return tb_drom_parse_entries(sw);
err:
kfree(sw->drom);
+ sw->drom = NULL;
return -EIO;

}
--
2.7.4