diff options
| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2026-01-15 08:22:37 +0300 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2026-01-19 13:49:21 +0300 |
| commit | 779c59274d03cc5c07237a2c845dfb71cff77705 (patch) | |
| tree | 2cfa90a095208f901415963d7a833c50b3451365 | |
| parent | 90541270967837c996631faa94e43d465e2a20c7 (diff) | |
| download | linux-779c59274d03cc5c07237a2c845dfb71cff77705.tar.xz | |
mtd: intel-dg: Fix accessing regions before setting nregions
The regions array is counted by nregions, but it's set only after
accessing it:
[] UBSAN: array-index-out-of-bounds in drivers/mtd/devices/mtd_intel_dg.c:750:15
[] index 0 is out of range for type '<unknown> [*]'
Fix it by also fixing an undesired behavior: the loop silently ignores
ENOMEM and continues setting the other entries.
CC: Gustavo A. R. Silva <gustavoars@kernel.org>
CC: Raag Jadav <raag.jadav@intel.com>
Reported-by: Jani Partanen <jiipee@sotapeli.fi>
Closes: https://lore.kernel.org/all/caca6c67-4f1d-49f1-948f-e63b6b937b29@sotapeli.fi
Fixes: ceb5ab3cb646 ("mtd: add driver for intel graphics non-volatile memory device")
Signed-off-by: Lucas De Marchi <demarchi@kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
| -rw-r--r-- | drivers/mtd/devices/mtd_intel_dg.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/mtd/devices/mtd_intel_dg.c b/drivers/mtd/devices/mtd_intel_dg.c index 2bab30dcd35f..7f751c48a76d 100644 --- a/drivers/mtd/devices/mtd_intel_dg.c +++ b/drivers/mtd/devices/mtd_intel_dg.c @@ -770,6 +770,7 @@ static int intel_dg_mtd_probe(struct auxiliary_device *aux_dev, kref_init(&nvm->refcnt); mutex_init(&nvm->lock); + nvm->nregions = nregions; for (n = 0, i = 0; i < INTEL_DG_NVM_REGIONS; i++) { if (!invm->regions[i].name) @@ -777,13 +778,15 @@ static int intel_dg_mtd_probe(struct auxiliary_device *aux_dev, char *name = kasprintf(GFP_KERNEL, "%s.%s", dev_name(&aux_dev->dev), invm->regions[i].name); - if (!name) - continue; + if (!name) { + ret = -ENOMEM; + goto err; + } + nvm->regions[n].name = name; nvm->regions[n].id = i; n++; } - nvm->nregions = n; /* in case where kasprintf fail */ ret = devm_pm_runtime_enable(device); if (ret < 0) { |