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| author |   Jonathan Lemon <jonathan.lemon@gmail.com> | 2022-03-29 09:03:54 -0700 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2022-03-30 12:08:11 -0700 |
| commit | 8f0588e80e33273c2fa219da4622affab0cdd22f (patch) | |
| tree | 9c13159d424cccf740ca9113b5bf4cb10ce2603f /drivers/ptp/ptp_ocp.c | |
| parent | net: dsa: felix: fix possible NULL pointer dereference (diff) | |
| download | linux-dev-8f0588e80e33273c2fa219da4622affab0cdd22f.tar.xz linux-dev-8f0588e80e33273c2fa219da4622affab0cdd22f.zip | |
ptp: ocp: handle error from nvmem_device_find
nvmem_device_find returns a valid pointer or IS_ERR().
Handle this properly.
Fixes: 0cfcdd1ebcfe ("ptp: ocp: add nvmem interface for accessing eeprom")
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/r/20220329160354.4035-1-jonathan.lemon@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/ptp/ptp_ocp.c')
| -rw-r--r-- | drivers/ptp/ptp_ocp.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c index c3d0fcf609e3..0feaa4b45317 100644 --- a/drivers/ptp/ptp_ocp.c +++ b/drivers/ptp/ptp_ocp.c @@ -1214,10 +1214,9 @@ ptp_ocp_nvmem_device_get(struct ptp_ocp *bp, const void * const tag) static inline void ptp_ocp_nvmem_device_put(struct nvmem_device **nvmemp) { - if (*nvmemp != NULL) { + if (!IS_ERR_OR_NULL(*nvmemp)) nvmem_device_put(*nvmemp); - *nvmemp = NULL; - } + *nvmemp = NULL; } static void @@ -1241,13 +1240,15 @@ ptp_ocp_read_eeprom(struct ptp_ocp *bp) } if (!nvmem) { nvmem = ptp_ocp_nvmem_device_get(bp, tag); - if (!nvmem) - goto out; + if (IS_ERR(nvmem)) { + ret = PTR_ERR(nvmem); + goto fail; + } } ret = nvmem_device_read(nvmem, map->off, map->len, BP_MAP_ENTRY_ADDR(bp, map)); if (ret != map->len) - goto read_fail; + goto fail; } bp->has_eeprom_data = true; @@ -1256,7 +1257,7 @@ out: ptp_ocp_nvmem_device_put(&nvmem); return; -read_fail: +fail: dev_err(&bp->pdev->dev, "could not read eeprom: %d\n", ret); goto out; } |