[Backport v3.7-branch] fs: ext2: Fix ext2 read buffer overflow #152904

Job	Run time
twister-build-prep	3m 56s
twister-build (1)	59m 32s
twister-build (2)	52m 2s
twister-build (3)	58m 3s
twister-build (4)	53m 25s
twister-build (5)	43m 51s
twister-build (6)	58m 30s
Publish Unit Tests Results	15s
Check Twister Status / all jobs passed	1s
	5h 29m 35s

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