From: Isaac J. Manjarres isaacmanjarres@google.com
commit 963b54df82b6d6206d7def273390bf3f7af558e1 upstream.
When allocating the 2D array for handling IRQ type registers in regmap_add_irq_chip_fwnode(), the intent is to allocate a matrix with num_config_bases rows and num_config_regs columns.
This is currently handled by allocating a buffer to hold a pointer for each row (i.e. num_config_bases). After that, the logic attempts to allocate the memory required to hold the register configuration for each row. However, instead of doing this allocation for each row (i.e. num_config_bases allocations), the logic erroneously does this allocation num_config_regs number of times.
This scenario can lead to out-of-bounds accesses when num_config_regs is greater than num_config_bases. Fix this by updating the terminating condition of the loop that allocates the memory for holding the register configuration to allocate memory only for each row in the matrix.
Amit Pundir reported a crash that was occurring on his db845c device due to memory corruption (see "Closes" tag for Amit's report). The KASAN report below helped narrow it down to this issue:
[ 14.033877][ T1] ================================================================== [ 14.042507][ T1] BUG: KASAN: invalid-access in regmap_add_irq_chip_fwnode+0x594/0x1364 [ 14.050796][ T1] Write of size 8 at addr 06ffff8081021850 by task init/1
[ 14.242004][ T1] The buggy address belongs to the object at ffffff8081021850 [ 14.242004][ T1] which belongs to the cache kmalloc-8 of size 8 [ 14.255669][ T1] The buggy address is located 0 bytes inside of [ 14.255669][ T1] 8-byte region [ffffff8081021850, ffffff8081021858)
Fixes: faa87ce9196d ("regmap-irq: Introduce config registers for irq types") Reported-by: Amit Pundir amit.pundir@linaro.org Closes: https://lore.kernel.org/all/CAMi1Hd04mu6JojT3y6wyN2YeVkPR5R3qnkKJ8iR8if_YByC... Tested-by: John Stultz jstultz@google.com Tested-by: Amit Pundir amit.pundir@linaro.org # tested on Dragonboard 845c Cc: stable@vger.kernel.org # v6.0+ Cc: Aidan MacDonald aidanmacdonald.0x0@gmail.com Cc: Saravana Kannan saravanak@google.com Cc: Catalin Marinas catalin.marinas@arm.com Signed-off-by: "Isaac J. Manjarres" isaacmanjarres@google.com Link: https://lore.kernel.org/r/20230711193059.2480971-1-isaacmanjarres@google.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/base/regmap/regmap-irq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/base/regmap/regmap-irq.c +++ b/drivers/base/regmap/regmap-irq.c @@ -843,7 +843,7 @@ int regmap_add_irq_chip_fwnode(struct fw if (!d->config_buf) goto err_alloc;
- for (i = 0; i < chip->num_config_regs; i++) { + for (i = 0; i < chip->num_config_bases; i++) { d->config_buf[i] = kcalloc(chip->num_config_regs, sizeof(**d->config_buf), GFP_KERNEL);