media: gspca: cpia1: shift-out-of-bounds in set_flicker

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: media: gspca: cpia1: shift-out-of-bounds in set_flicker Syzkaller reported the following issue: UBSAN: shift-out-of-bounds in drivers/media/usb/gspca/cpia1.c:1031:27 shift exponent 245 is too large for 32-bit type 'int' When the value of the variable "sd->params.exposure.gain" exceeds the number of bits in an integer, a shift-out-of-bounds error is reported. It is triggered because the variable "currentexp" cannot be left-shifted by more than the number of bits in an integer. In order to avoid invalid range during left-shift, the conditional expression is added.

References

• https://git.kernel.org/stable/c/69bba62600bd91d6b7c1e8ca181faf8ac64f7060
• https://git.kernel.org/stable/c/2eee8edfff90e22980a6b22079d238c3c9d323bb
• https://git.kernel.org/stable/c/8f83c85ee88225319c52680792320c02158c2a9b
• https://git.kernel.org/stable/c/c6b6b8692218da73b33b310d7c1df90f115bdd9a
• https://git.kernel.org/stable/c/09cd8b561aa9796903710a1046957f2b112c8f26
• https://git.kernel.org/stable/c/a647f27a7426d2fe1b40da7c8fa2b81354a51177
• https://git.kernel.org/stable/c/93bddd6529f187f510eec759f37d0569243c9809
• https://git.kernel.org/stable/c/e2d7149b913d14352c82624e723ce1c211ca06d3
• https://git.kernel.org/stable/c/099be1822d1f095433f4b08af9cc9d6308ec1953