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1ad71103e1
[ Upstream commit c02189e12c ]
A left shift must shift less than the bit width of the left argument.
Avoid triggering undefined behavior if ha->mbx_count == 32.
This patch avoids that UBSAN reports the following complaint:
UBSAN: Undefined behaviour in drivers/scsi/qla2xxx/qla_isr.c:275:14
shift exponent 32 is too large for 32-bit type 'int'
Call Trace:
dump_stack+0x4e/0x6c
ubsan_epilogue+0xd/0x3b
__ubsan_handle_shift_out_of_bounds+0x112/0x14c
qla2x00_mbx_completion+0x1c5/0x25d [qla2xxx]
qla2300_intr_handler+0x1ea/0x3bb [qla2xxx]
qla2x00_mailbox_command+0x77b/0x139a [qla2xxx]
qla2x00_mbx_reg_test+0x83/0x114 [qla2xxx]
qla2x00_chip_diag+0x354/0x45f [qla2xxx]
qla2x00_initialize_adapter+0x2c2/0xa4e [qla2xxx]
qla2x00_probe_one+0x1681/0x392e [qla2xxx]
pci_device_probe+0x10b/0x1f1
driver_probe_device+0x21f/0x3a4
__driver_attach+0xa9/0xe1
bus_for_each_dev+0x6e/0xb5
driver_attach+0x22/0x3c
bus_add_driver+0x1d1/0x2ae
driver_register+0x78/0x130
__pci_register_driver+0x75/0xa8
qla2x00_module_init+0x21b/0x267 [qla2xxx]
do_one_initcall+0x5a/0x1e2
do_init_module+0x9d/0x285
load_module+0x20db/0x38e3
SYSC_finit_module+0xa8/0xbc
SyS_finit_module+0x9/0xb
do_syscall_64+0x77/0x271
entry_SYSCALL64_slow_path+0x25/0x25
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Laurence Oberman <loberman@redhat.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.