| Message ID | 1619774627-118766-1-git-send-email-jiapeng.chong@linux.alibaba.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | scsi: target: configfs: Remove redundant assignment to ret | expand |
On 30.04.21 11:23, Jiapeng Chong wrote: > Variable ret is set to '-EINVAL' but this value is never read as it is > overwritten later on, hence it is a redundant assignment and can be > removed. > > Clean up the following clang-analyzer warning: > > drivers/target/target_core_configfs.c:2037:5: warning: Value stored to > 'ret' is never read [clang-analyzer-deadcode.DeadStores]. > > drivers/target/target_core_configfs.c:1973:5: warning: Value stored to > 'ret' is never read [clang-analyzer-deadcode.DeadStores]. > > drivers/target/target_core_configfs.c:1959:5: warning: Value stored to > 'ret' is never read [clang-analyzer-deadcode.DeadStores]. > > Reported-by: Abaci Robot <abaci@linux.alibaba.com> > Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> > --- > drivers/target/target_core_configfs.c | 3 --- > 1 file changed, 3 deletions(-) > > diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c > index 4b2e493..bda05c3 100644 > --- a/drivers/target/target_core_configfs.c > +++ b/drivers/target/target_core_configfs.c > @@ -1956,7 +1956,6 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item, > pr_err("APTPL metadata initiator_node=" > " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n", > PR_APTPL_MAX_IPORT_LEN); > - ret = -EINVAL; > break; > } > break; > @@ -1970,7 +1969,6 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item, > pr_err("APTPL metadata initiator_isid" > "= exceeds PR_REG_ISID_LEN: %d\n", > PR_REG_ISID_LEN); > - ret = -EINVAL; > break; > } > break; > @@ -2034,7 +2032,6 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item, > pr_err("APTPL metadata target_node=" > " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n", > PR_APTPL_MAX_TPORT_LEN); > - ret = -EINVAL; > break; > } > break; > I don't think storing -EINVAL in ret is wrong. But maybe the "break" in the next line should better be "goto out"? AFAICS, the "break" finally leads to calling core_scsi3_alloc_aptpl_registration () despite a too long string in i_port, isid or t_port. Is this behaviour intentional? BTW: why is "initiator_sid" input handled as string? core_scsi3_alloc_aptpl_registration later calls get_unaligned_be64 for that string. I don't think this makes sense. Finally, I think there is a possible memory leak. If the input written to res_aptpl_metadata for example contains "initiator_sid=xxxxx" more than once, a previously created string isid ("isid = match_strdup(args)") is not freed before it is overwritten in the loop. The same is true for all tokens handled with match_strdup.
On 4/30/21 9:29 AM, Bodo Stroesser wrote: > BTW: why is "initiator_sid" input handled as string? > core_scsi3_alloc_aptpl_registration later calls get_unaligned_be64 for > that string. I don't think this makes sense. It's broken. Remember the isid patches that you reviewed of mine trying to fix the isid code in target_core_transport.c? I can't remember all the details but I think it was that the aptpl code thinks the buffer is in the format that sess_get_initiator_sid uses and is trying to do something similar as target_core_transport.c. I can't find the version of the patches you had looked at. This was the first version of the patch: https://patchwork.kernel.org/project/target-devel/patch/1531696591-8558-3-git-send-email-mchristi@redhat.com/
On 30.04.21 17:40, michael.christie@oracle.com wrote: > On 4/30/21 9:29 AM, Bodo Stroesser wrote: >> BTW: why is "initiator_sid" input handled as string? >> core_scsi3_alloc_aptpl_registration later calls get_unaligned_be64 for >> that string. I don't think this makes sense. > > It's broken. > > Remember the isid patches that you reviewed of mine trying to fix the > isid code in target_core_transport.c? I can't remember all the details but > I think it was that the aptpl code thinks the buffer is in the format that > sess_get_initiator_sid uses and is trying to do something similar as > target_core_transport.c. > > I can't find the version of the patches you had looked at. This was the first > version of the patch: > > https://patchwork.kernel.org/project/target-devel/patch/1531696591-8558-3-git-send-email-mchristi@redhat.com/ > Ahh, yes. I remember. Thank you.
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c index 4b2e493..bda05c3 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -1956,7 +1956,6 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item, pr_err("APTPL metadata initiator_node=" " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n", PR_APTPL_MAX_IPORT_LEN); - ret = -EINVAL; break; } break; @@ -1970,7 +1969,6 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item, pr_err("APTPL metadata initiator_isid" "= exceeds PR_REG_ISID_LEN: %d\n", PR_REG_ISID_LEN); - ret = -EINVAL; break; } break; @@ -2034,7 +2032,6 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item, pr_err("APTPL metadata target_node=" " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n", PR_APTPL_MAX_TPORT_LEN); - ret = -EINVAL; break; } break;
Variable ret is set to '-EINVAL' but this value is never read as it is overwritten later on, hence it is a redundant assignment and can be removed. Clean up the following clang-analyzer warning: drivers/target/target_core_configfs.c:2037:5: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]. drivers/target/target_core_configfs.c:1973:5: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]. drivers/target/target_core_configfs.c:1959:5: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]. Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> --- drivers/target/target_core_configfs.c | 3 --- 1 file changed, 3 deletions(-)