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powerpc/pseries: lparcfg - fix kbuf[] underflow

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In lparcfg_write(), a count of 0 results in kbuf[] being indexed at -1.
Check for count == 0 in the existing check for count > sizeof(kbuf) and
return -EINVAL if true.

Fixes: 74422e2b19 ("powerpc/pseries: Remove VLA from lparcfg_write()")
Acked-by: Nayna Jain <nayna@linux.ibm.com>
Tested-by: R Nageswara Sastry <rnsastry@linux.ibm.com>
Cc: stable@vger.kernel.org # 4.20
Signed-off-by: George Wilson <gcwilson@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
This commit is contained in:
George Wilson 2026-08-07 11:59:00 -05:00 committed by Madhavan Srinivasan
parent 649c10bff5
commit fb442a6673
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/platforms/pseries/lparcfg.c
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@ -699,7 +699,7 @@ static ssize_t lparcfg_write(struct file *file, const char __user * buf,
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return -EINVAL;
if (count > sizeof(kbuf))
if (count == 0 || count > sizeof(kbuf))
return -EINVAL;
if (copy_from_user(kbuf, buf, count))