In the Linux kernel, the following vulnerability has been resolved: scsi: bfa: Fix use-after-free in bfadimmoduleexit() BUG: KASAN: slab-use-after-free in _lockacquire+0x2aca/0x3a20 Read of size 8 at addr ffff8881082d80c8 by task modprobe/25303 Call Trace: <TASK> dumpstacklvl+0x95/0xe0 printreport+0xcb/0x620 kasanreport+0xbd/0xf0 _lockacquire+0x2aca/0x3a20 lockacquire+0x19b/0x520 rawspinlock+0x2b/0x40 attributecontainerunregister+0x30/0x160 fcreleasetransport+0x19/0x90 [scsitransportfc] bfadimmoduleexit+0x23/0x60 [bfa] bfadinit+0xdb/0xff0 [bfa] dooneinitcall+0xdc/0x550 doinitmodule+0x22d/0x6b0 loadmodule+0x4e96/0x5ff0 initmodulefromfile+0xcd/0x130 idempotentinitmodule+0x330/0x620 _x64sysfinitmodule+0xb3/0x110 dosyscall64+0xc1/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f </TASK> Allocated by task 25303: kasansavestack+0x24/0x50 kasansavetrack+0x14/0x30 _kasankmalloc+0x7f/0x90 fcattachtransport+0x4f/0x4740 [scsitransportfc] bfadimmoduleinit+0x17/0x80 [bfa] bfadinit+0x23/0xff0 [bfa] dooneinitcall+0xdc/0x550 doinitmodule+0x22d/0x6b0 loadmodule+0x4e96/0x5ff0 initmodulefromfile+0xcd/0x130 idempotentinitmodule+0x330/0x620 _x64sysfinitmodule+0xb3/0x110 dosyscall64+0xc1/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f Freed by task 25303: kasansavestack+0x24/0x50 kasansavetrack+0x14/0x30 kasansavefreeinfo+0x3b/0x60 _kasanslabfree+0x38/0x50 kfree+0x212/0x480 bfadimmoduleinit+0x7e/0x80 [bfa] bfadinit+0x23/0xff0 [bfa] dooneinitcall+0xdc/0x550 doinitmodule+0x22d/0x6b0 loadmodule+0x4e96/0x5ff0 initmodulefromfile+0xcd/0x130 idempotentinitmodule+0x330/0x620 _x64sysfinitmodule+0xb3/0x110 dosyscall64+0xc1/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f Above issue happens as follows: bfadinit error = bfadimmoduleinit() fcreleasetransport(bfadimscsitransporttemplate); if (error) goto ext; ext: bfadimmoduleexit(); fcreleasetransport(bfadimscsitransporttemplate); --> Trigger double release Don't call bfadimmoduleexit() if bfadimmoduleinit() failed.
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