4.18-stable review patch. If anyone has any objections, please let me know.
------------------ From: Stephen Boyd <[email protected]> [ Upstream commit 20edec388277b62ddfddb8b2b376a937a2cd6d1b ] Both callers of coreboot_table_init() ioremap the pointer that comes in but they don't unmap the memory on failure. Both of them also fail probe immediately with the return value of coreboot_table_init(), leaking a mapping when it fails. The mapping isn't necessary at all after devices are populated either, so we can just drop the mapping here when we exit the function. Let's do that to simplify the code a bit and plug the leak. Cc: Wei-Ning Huang <[email protected]> Cc: Julius Werner <[email protected]> Cc: Brian Norris <[email protected]> Cc: Samuel Holland <[email protected]> Fixes: 570d30c2823f ("firmware: coreboot: Expose the coreboot table as a bus") Signed-off-by: Stephen Boyd <[email protected]> Reviewed-by: Julius Werner <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/firmware/google/coreboot_table.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/firmware/google/coreboot_table.c +++ b/drivers/firmware/google/coreboot_table.c @@ -110,7 +110,8 @@ int coreboot_table_init(struct device *d if (strncmp(header.signature, "LBIO", sizeof(header.signature))) { pr_warn("coreboot_table: coreboot table missing or corrupt!\n"); - return -ENODEV; + ret = -ENODEV; + goto out; } ptr_entry = (void *)ptr_header + header.header_bytes; @@ -137,7 +138,8 @@ int coreboot_table_init(struct device *d ptr_entry += entry.size; } - +out: + iounmap(ptr); return ret; } EXPORT_SYMBOL(coreboot_table_init); @@ -146,7 +148,6 @@ int coreboot_table_exit(void) { if (ptr_header) { bus_unregister(&coreboot_bus_type); - iounmap(ptr_header); ptr_header = NULL; }
