From e37d0215830b1221c7a0c62f4642716b142f8f5c Mon Sep 17 00:00:00 2001 From: Avnish Chouhan Date: Mon, 12 Jan 2026 23:20:14 +0530 Subject: [PATCH] kern/ieee1275/openfw: Add a check for invalid partition number The grub_strtoul() may fail in several scenarios like invalid input, overflow, etc. Lack of proper check may lead to unexpected failures in the code further. Signed-off-by: Avnish Chouhan Reviewed-by: Daniel Kiper --- grub-core/kern/ieee1275/openfw.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/grub-core/kern/ieee1275/openfw.c b/grub-core/kern/ieee1275/openfw.c index 3b492dd96..06757f5d8 100644 --- a/grub-core/kern/ieee1275/openfw.c +++ b/grub-core/kern/ieee1275/openfw.c @@ -512,7 +512,20 @@ grub_ieee1275_encode_devname (const char *path) } if (partition && partition[0]) { - unsigned int partno = grub_strtoul (partition, 0, 0); + unsigned long partno; + const char *endptr; + + partno = grub_strtoul (partition, &endptr, 0); + grub_errno = GRUB_ERR_NONE; + if (*endptr != '\0' || partno > 65535 || + (partno == 0 && ! grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_0_BASED_PARTITIONS))) + { + grub_free (partition); + grub_free (device); + grub_free (encoding); + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid partition number")); + return NULL; + } *optr++ = ','; @@ -520,7 +533,7 @@ grub_ieee1275_encode_devname (const char *path) /* GRUB partition 1 is OF partition 0. */ partno++; - grub_snprintf (optr, sizeof ("XXXXXXXXXXXX"), "%d", partno); + grub_snprintf (optr, sizeof ("XXXXXXXXXXXX"), "%lu", partno); } else *optr = '\0';