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| author | Louis Rannou <lrannou@baylibre.com> | 2023-02-03 10:07:54 +0300 |
|---|---|---|
| committer | Tudor Ambarus <tudor.ambarus@linaro.org> | 2023-02-06 11:36:18 +0300 |
| commit | f0f0cfdc3a024e21161714f2e05f0df3b84d42ad (patch) | |
| tree | 978c5b0286f5453bc5dd5aa63cf1f3ae0b7a7294 /drivers/mtd/spi-nor/sfdp.c | |
| parent | 59273180299ad264d086135e8199c1b05ea51b69 (diff) | |
| download | linux-f0f0cfdc3a024e21161714f2e05f0df3b84d42ad.tar.xz | |
mtd: spi-nor: Fix shift-out-of-bounds in spi_nor_set_erase_type
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@vger.kernel.org
Reported-by: Alexander Stein <Alexander.Stein@tq-group.com>
Signed-off-by: Louis Rannou <lrannou@baylibre.com>
Tested-by: Alexander Stein <Alexander.Stein@tq-group.com>
Link: https://lore.kernel.org/r/20230203070754.50677-1-tudor.ambarus@linaro.org
[ta: refine changes, new commit message, fix compilation error]
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Diffstat (limited to 'drivers/mtd/spi-nor/sfdp.c')
| -rw-r--r-- | drivers/mtd/spi-nor/sfdp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c index 3acc01c3a900..526c5d57b905 100644 --- a/drivers/mtd/spi-nor/sfdp.c +++ b/drivers/mtd/spi-nor/sfdp.c @@ -875,7 +875,7 @@ static int spi_nor_init_non_uniform_erase_map(struct spi_nor *nor, */ 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; } @@ -1089,7 +1089,7 @@ static int spi_nor_parse_4bait(struct spi_nor *nor, erase_type[i].opcode = (dwords[SFDP_DWORD(2)] >> 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]); } /* |