This is a note to let you know that I've just added the patch titled mtd: spi-nor: Fix shift-out-of-bounds in spi_nor_set_erase_type to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mtd-spi-nor-fix-shift-out-of-bounds-in-spi_nor_set_erase_type.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From f0f0cfdc3a024e21161714f2e05f0df3b84d42ad Mon Sep 17 00:00:00 2001 From: Louis Rannou <lrannou@xxxxxxxxxxxx> Date: Fri, 3 Feb 2023 09:07:54 +0200 Subject: mtd: spi-nor: Fix shift-out-of-bounds in spi_nor_set_erase_type From: Louis Rannou <lrannou@xxxxxxxxxxxx> commit f0f0cfdc3a024e21161714f2e05f0df3b84d42ad upstream. spi_nor_set_erase_type() was used either to set or to mask out an erase type. When we used it to mask out an erase type a shift-out-of-bounds was hit: UBSAN: shift-out-of-bounds in drivers/mtd/spi-nor/core.c:2237:24 shift exponent 4294967295 is too large for 32-bit type 'int' The setting of the size_{shift, mask} and of the opcode are unnecessary when the erase size is zero, as throughout the code just the erase size is considered to determine whether an erase type is supported or not. Setting the opcode to 0xFF was wrong too as nobody guarantees that 0xFF is an unused opcode. Thus when masking out an erase type, just set the erase size to zero. This will fix the shift-out-of-bounds. Fixes: 5390a8df769e ("mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories") Cc: stable@xxxxxxxxxxxxxxx Reported-by: Alexander Stein <Alexander.Stein@xxxxxxxxxxxx> Signed-off-by: Louis Rannou <lrannou@xxxxxxxxxxxx> Tested-by: Alexander Stein <Alexander.Stein@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20230203070754.50677-1-tudor.ambarus@xxxxxxxxxx [ta: refine changes, new commit message, fix compilation error] Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/mtd/spi-nor/core.c | 9 +++++++++ drivers/mtd/spi-nor/core.h | 1 + drivers/mtd/spi-nor/sfdp.c | 4 ++-- 3 files changed, 12 insertions(+), 2 deletions(-) --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -2425,6 +2425,15 @@ void spi_nor_set_erase_type(struct spi_n } /** + * spi_nor_mask_erase_type() - mask out a SPI NOR erase type + * @erase: pointer to a structure that describes a SPI NOR erase type + */ +void spi_nor_mask_erase_type(struct spi_nor_erase_type *erase) +{ + erase->size = 0; +} + +/** * spi_nor_init_uniform_erase_map() - Initialize uniform erase map * @map: the erase map of the SPI NOR * @erase_mask: bitmask encoding erase types that can erase the entire --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -424,6 +424,7 @@ void spi_nor_set_pp_settings(struct spi_ void spi_nor_set_erase_type(struct spi_nor_erase_type *erase, u32 size, u8 opcode); +void spi_nor_mask_erase_type(struct spi_nor_erase_type *erase); struct spi_nor_erase_region * spi_nor_region_next(struct spi_nor_erase_region *region); void spi_nor_init_uniform_erase_map(struct spi_nor_erase_map *map, --- a/drivers/mtd/spi-nor/sfdp.c +++ b/drivers/mtd/spi-nor/sfdp.c @@ -852,7 +852,7 @@ spi_nor_init_non_uniform_erase_map(struc */ for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) if (!(regions_erase_type & BIT(erase[i].idx))) - spi_nor_set_erase_type(&erase[i], 0, 0xFF); + spi_nor_mask_erase_type(&erase[i]); return 0; } @@ -1063,7 +1063,7 @@ static int spi_nor_parse_4bait(struct sp erase_type[i].opcode = (dwords[1] >> erase_type[i].idx * 8) & 0xFF; else - spi_nor_set_erase_type(&erase_type[i], 0u, 0xFF); + spi_nor_mask_erase_type(&erase_type[i]); } /* Patches currently in stable-queue which might be from lrannou@xxxxxxxxxxxx are queue-5.10/mtd-spi-nor-fix-shift-out-of-bounds-in-spi_nor_set_erase_type.patch