6.6-stable review patch. If anyone has any objections, please let me know.
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From: Junrui Luo moonafterrain@outlook.com
[ Upstream commit 15dd100349b8526cbdf2de0ce3e72e700eb6c208 ]
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: 35f0ce032b0f ("IBM Real-Time "SMI Free" mode driver -v7") Signed-off-by: Junrui Luo moonafterrain@outlook.com Link: https://patch.msgid.link/SYBPR01MB78812D887A92DE3802D0D06EAFA9A@SYBPR01MB788... 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 --- drivers/platform/x86/ibm_rtl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/platform/x86/ibm_rtl.c b/drivers/platform/x86/ibm_rtl.c index 2ab7d9ac542d..5fb25a602533 100644 --- a/drivers/platform/x86/ibm_rtl.c +++ b/drivers/platform/x86/ibm_rtl.c @@ -272,7 +272,7 @@ 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;