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authorBrian Norris <computersforpeace@gmail.com>2015-09-02 16:34:35 -0700
committerBrian Norris <computersforpeace@gmail.com>2015-09-02 16:34:35 -0700
commit2ff46e6fea6254ac8fa97aeb9c14e51436ab95f6 (patch)
treed8bfcf9a77cae2295460406d79d152f66a491f22 /drivers/mtd
parent0f12a27b47284e86eaa4a5ad3877ec3018463178 (diff)
mtd: spi-nor: fix NULL dereference when no match found in spi_nor_ids[]
Commit 06bb6f5a69df ("mtd: spi-nor: stop (ab)using struct spi_device_id") converted an array into a pointer, which means that we should be checking if the pointer goes anywhere, not whether the C string is empty. To do the latter means we dereference a NULL pointer when we reach the terminating entry, for which 'name' is now NULL instead of an array { 0, 0, ... }. Sample crash: [ 1.101371] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 1.109457] pgd = c0004000 [ 1.112157] [00000000] *pgd=00000000 [ 1.115736] Internal error: Oops: 5 [#1] SMP ARM [ 1.120345] Modules linked in: [ 1.123405] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.2.0-next-20150902+ #61 [ 1.130611] Hardware name: Rockchip (Device Tree) [ 1.135306] task: ee0b8d40 ti: ee0ba000 task.ti: ee0ba000 [ 1.140697] PC is at spi_nor_scan+0x90/0x8c4 [ 1.144958] LR is at spi_nor_scan+0xa4/0x8c4 ... [ 1.504112] [<c03cc2e0>] (spi_nor_scan) from [<c03cb188>] (m25p_probe+0xc8/0x11c) [ 1.511583] [<c03cb188>] (m25p_probe) from [<c03cd9d8>] (spi_drv_probe+0x60/0x7c) [ 1.519055] [<c03cd9d8>] (spi_drv_probe) from [<c037faa0>] (driver_probe_device+0x1a0/0x444) [ 1.527478] [<c037faa0>] (driver_probe_device) from [<c037fec8>] (__device_attach_driver+0x94/0xa0) [ 1.536507] [<c037fec8>] (__device_attach_driver) from [<c037db3c>] (bus_for_each_drv+0x94/0xa4) [ 1.545277] [<c037db3c>] (bus_for_each_drv) from [<c037f7e4>] (__device_attach+0xa4/0x144) [ 1.553526] [<c037f7e4>] (__device_attach) from [<c0380058>] (device_initial_probe+0x1c/0x20) [ 1.562035] [<c0380058>] (device_initial_probe) from [<c037ec88>] (bus_probe_device+0x38/0x94) [ 1.570631] [<c037ec88>] (bus_probe_device) from [<c037ccf4>] (device_add+0x430/0x558) [ 1.578534] [<c037ccf4>] (device_add) from [<c03d0240>] (spi_add_device+0xe4/0x174) [ 1.586178] [<c03d0240>] (spi_add_device) from [<c03d0a24>] (spi_register_master+0x698/0x7d4) [ 1.594688] [<c03d0a24>] (spi_register_master) from [<c03d0ba0>] (devm_spi_register_master+0x40/0x7c) [ 1.603892] [<c03d0ba0>] (devm_spi_register_master) from [<c03d2fb4>] (rockchip_spi_probe+0x360/0x3f4) [ 1.613182] [<c03d2fb4>] (rockchip_spi_probe) from [<c0381e34>] (platform_drv_probe+0x58/0xa8) [ 1.621779] [<c0381e34>] (platform_drv_probe) from [<c037faa0>] (driver_probe_device+0x1a0/0x444) [ 1.630635] [<c037faa0>] (driver_probe_device) from [<c037fdc4>] (__driver_attach+0x80/0xa4) [ 1.639058] [<c037fdc4>] (__driver_attach) from [<c037e850>] (bus_for_each_dev+0x98/0xac) [ 1.647221] [<c037e850>] (bus_for_each_dev) from [<c037f448>] (driver_attach+0x28/0x30) [ 1.655210] [<c037f448>] (driver_attach) from [<c037ef74>] (bus_add_driver+0x128/0x250) [ 1.663200] [<c037ef74>] (bus_add_driver) from [<c0380c40>] (driver_register+0xac/0xf0) [ 1.671191] [<c0380c40>] (driver_register) from [<c0381d50>] (__platform_driver_register+0x58/0x6c) [ 1.680221] [<c0381d50>] (__platform_driver_register) from [<c0a467c8>] (rockchip_spi_driver_init+0x18/0x20) [ 1.690033] [<c0a467c8>] (rockchip_spi_driver_init) from [<c00098a4>] (do_one_initcall+0x124/0x1dc) [ 1.699063] [<c00098a4>] (do_one_initcall) from [<c0a19f84>] (kernel_init_freeable+0x218/0x2ec) [ 1.707748] [<c0a19f84>] (kernel_init_freeable) from [<c0719ed8>] (kernel_init+0x1c/0xf4) [ 1.715912] [<c0719ed8>] (kernel_init) from [<c000fe50>] (ret_from_fork+0x14/0x24) [ 1.723460] Code: e3510000 159f67c0 0a00000c e5961000 (e5d13000) [ 1.729564] ---[ end trace 95baa6b3b861ce25 ]--- Fixes: 06bb6f5a69df ("mtd: spi-nor: stop (ab)using struct spi_device_id") Signed-off-by: Brian Norris <computersforpeace@gmail.com> Cc: Rafał Miłecki <zajec5@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/spi-nor/spi-nor.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 25372f9b534e..f59aedfe1462 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1218,7 +1218,7 @@ static const struct flash_info *spi_nor_match_id(const char *name)
{
const struct flash_info *id = spi_nor_ids;
- while (id->name[0]) {
+ while (id->name) {
if (!strcmp(name, id->name))
return id;
id++;