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platform/x86: ibm_rtl: fix EBDA signature search pointer arithmetic

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[ Upstream commit 15dd100349 ]

The ibm_rtl_init() function searches for the signature but has a pointer
arithmetic error. The loop counter suggests searching at 4-byte intervals
but the implementation only advances by 1 byte per iteration.

Fix by properly advancing the pointer by sizeof(unsigned int) bytes
each iteration.

Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Reported-by: Junrui Luo <moonafterrain@outlook.com>
Fixes: 35f0ce032b ("IBM Real-Time "SMI Free" mode driver -v7")
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Link: https://patch.msgid.link/SYBPR01MB78812D887A92DE3802D0D06EAFA9A@SYBPR01MB7881.ausprd01.prod.outlook.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Junrui Luo
2025-12-19 16:30:29 +08:00
committed by Greg Kroah-Hartman
parent b1718c819f
commit d95544ee2b
1 changed files with 1 additions and 1 deletions
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drivers/platform/x86/ibm_rtl.c
+1 -1
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@@ -273,7 +273,7 @@ static int __init ibm_rtl_init(void) {
/* search for the _RTL_ signature at the start of the table */
for (i = 0 ; i < ebda_size/sizeof(unsigned int); i++) {
struct ibm_rtl_table __iomem * tmp;
tmp = (struct ibm_rtl_table __iomem *) (ebda_map+i);
tmp = (struct ibm_rtl_table __iomem *) (ebda_map + i*sizeof(unsigned int));
if ((readq(&tmp->signature) & RTL_MASK) == RTL_SIGNATURE) {
phys_addr_t addr;
unsigned int plen;